Mazda Trucks 1994-1998 Repair Guide

Engine

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OIL LEVEL CHECK



See Figures 1, 2 and 3

Check the engine oil level every time you fill the gas tank. The oil level should be above the ADD or L (LOW) mark and not above the FULL or F mark on the dipstick. Make sure that the dipstick is inserted into the crankcase as far as possible and that the vehicle is resting on level ground. Also, allow a few minutes after turning off the engine for the oil to drain into the pan or an inaccurate reading will result.

  1. Open the hood and remove the engine oil dipstick.
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Fig. Fig. 1: The oil level dipstick is located on the right side of the engine-MPV

  1. Wipe the dipstick with a clean, lint-free rag and reinsert it. Be sure to insert it all the way.
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  3. Pull out the dipstick and note the oil level. It should be between the FULL or F mark and the ADD or L (LOW) mark.
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Fig. Fig. 2: Oil level dipstick measurement

  1. If the level is below the lower mark, install the dipstick and add fresh oil to bring the level within the proper range. Do not overfill.
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Fig. Fig. 3: Pour the engine oil, using a funnel, through the oil fill hole located on the right side valve cover-MPV

  1. Recheck the oil level and close the hood.
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Use a multi-grade oil with API classification SG or better.

OIL & FILTER CHANGE



See Figures 4 through 12

The engine oil and oil filter should be changed at the recommended intervals on the Maintenance Chart. Though some manufacturer's have at times recommended changing the filter only at every other oil change, we recommend that you always change the filter with the oil. The benefit of fresh oil is quickly lost if the old filter is clogged and unable to do its job. Also, leaving the old filter in place leaves a significant amount of dirty oil in the system.

The oil should be changed more frequently if the vehicle is being operated in a very dusty area. Before draining the oil, make sure that the engine is at operating temperature. Hot oil will hold more impurities in suspension and will flow better, allowing the removal of more oil and dirt.

It is usually a good idea to place your ignition key in the box or bag with the bottles of fresh engine oil. In this way it will be VERY HARD to forget to refill the engine crankcase before you go to start the engine.

  1. Raise and support the vehicle safely on jackstands. Make sure the oil drain plug is at the lowest point on the oil pan. If not, you may have to raise the vehicle slightly higher on one jackstand (side) than the other.
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  3. Before you crawl under the car, take a look at where you will be working and gather all the necessary tools: such as a few wrenches or a strip of sockets, the drain pan, a clean rag, and, if the oil filter is more accessible from underneath the vehicle, you will also want to grab a bottle of oil, the new filter and a filter wrench at this time.
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CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Position the drain pan beneath the oil pan drain plug. Keep in mind that the fast flowing oil, which will spill out as you pull the plug from the pan, will flow with enough force that it could miss the pan. Position the drain pan accordingly and be ready to move the pan more directly beneath the plug as the oil flow lessens to a trickle.
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Fig. Fig. 4: Using a box wrench, loosen the oil pan drain plug



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Fig. Fig. 5: Unscrew the plug by hand. Keep an inward pressure on the plug as you unscrew it, so the oil won't escape until you pull the plug away to drain the oil



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Fig. Fig. 6: Clean up the oil pan drain plug and always replace the crush washer

  1. Loosen the drain plug with a wrench (or socket and driver), then carefully unscrew the plug with your fingers. Use a rag to shield your fingers from the heat. Push in on the plug as you unscrew it so you can feel when all of the screw threads are out of the hole (and so you will keep the oil from seeping past the threads until you are ready to remove the plug). You can then remove the plug quickly to avoid having hot oil run down your arm. This will also help assure that you have the plug in your hand, not in the bottom of a pan of hot oil.
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CAUTION
Be careful of the oil; when at operating temperature, it is hot enough to cause a severe burn.

  1. Allow the oil to drain until nothing but a few drops come out of the drain hole. Check the drain plug to make sure the threads and sealing surface are not damaged. Install a new gasket onto the drain plug, then carefully thread the plug into position and tighten it with a torque wrench to 15-20 ft. lbs. (20-27 Nm) for the B Series Pick-up and Navajo models or 22-30 ft. lbs. (30-41 Nm) for the MPV models. If a torque wrench is not available, snug the drain plug and give a slight additional turn. You don't want the plug to fall out (as you would quickly become stranded), but the pan threads are EASILY stripped from overtighening (and this can be time consuming and/or costly to fix).
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Fig. Fig. 7: An oil filter can be removed with a variety of tools. One tool that is good to use is the filter wrench ...



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Fig. Fig. 8: ... another good tool is an end cap filter wrench used along with a ratchet and extension



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Fig. Fig. 9: Remove the oil filter. Be careful not to make a big mess

  1. The oil filter is located on the bottom passenger side of the 2.6L and 4.0L engines and on the driver side of all other engines; position the drain pan beneath it. To remove the filter, you may need an oil filter wrench since the filter may have been fitted too tightly and/or the heat from the engine may have made it even tighter. A filter wrench can be obtained at any auto parts store and is well-worth the investment. Loosen the filter with the filter wrench. With a rag wrapped around the filter, unscrew the filter from the boss on the side of the engine. Be careful of hot oil that will run down the side of the filter. Make sure that your drain pan is under the filter before you start to remove it from the engine; should some of the hot oil happen to get on you, there will be a place to dump the filter in a hurry and the filter will usually spill a good bit of dirty oil as it is removed.
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Fig. Fig. 10: Be sure to clean the gasket mounting surface of any dirt before installing a new oil filter



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Fig. Fig. 11: Before installing a new oil filter, lightly coat the rubber gasket with clean engine oil



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Fig. Fig. 12: Always install the new filter by hand (an oil filter wrench will usually lead to overtightening)

  1. Wipe the base of the mounting boss with a clean, dry cloth. When you install the new filter, smear a small amount of fresh oil on the gasket with your finger, just enough to coat the entire contact surface. When you tighten the filter, rotate it about a half-turn after it contacts the mounting boss (or follow any instructions which are provided on the filter or parts box).
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WARNING
Never operate the engine without engine oil, otherwise SEVERE engine damage will be the result.

  1. Remove the jackstands and carefully lower the vehicle, then IMMEDIATELY refill the engine crankcase with the proper amount of oil. DO NOT WAIT TO DO THIS because if you forget and someone tries to start the car, severe engine damage will occur.
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  3. Refill the engine crankcase slowly, checking the level often. You may notice that it usually takes less than the amount of oil listed in the capacity chart to refill the crankcase. But, that is only until the engine is run and the oil filter is filled with oil. To make sure the proper level is obtained, run the engine to normal operating temperature. While the engine is warming, look under the vehicle for any oil leaks, and if found, shut the engine OFF immediately, then fix the leak. Shut the engine OFF , allow the oil to drain back into the oil pan, and recheck the level. Top off the oil at this time to the fill mark.
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If the vehicle is not resting on level ground, the oil level reading on the dipstick may be slightly off. Be sure to check the level only when the car is sitting level.

  1. Drain your used oil in a suitable container for recycling and clean-up your tools, as you will be needing them again in a few thousand more miles (kilometers).
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