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Lube for 5spd getrag

1836 Views 18 Replies 12 Participants Last post by  coma700
What do I put in the manual tranny. It is a 91 d250
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· I bleed Diesel
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5-30 mobil one fully senthetic with syntec. works GREAT add an extra quart or you will burn 5thgear
 

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Discussion Starter · #7 ·
Hello I had 5/30 mobile 1 full synthetic// I could not find syntech, but there was something like it syn**** which i used. it only took 4 qts. Both mechanics walked up to me and asked me if I really wanted to put motor oil in the transmission. NOW I AM WORRIED!!! tHEY PUT IT IN. HELP:shock:
 

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my dad and local mechanic swear up and down that your not supposed to put motor oil in it but i been runnin it and so did the previous owner. so im happy to say i proved them wrong.
 

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Perhaps they should read the FSM. It specifically calls for 4 qts of 5w-30. I use 5qts, fill through the shifter hole.
 

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It sure takes a lot of convincing for some people. If I recall there was even a tag on the plug advising to use MOTOR OIL.
The extra quart is to assure lube for bearing between input and output shaft. A weak point on this tranny.
 

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i just changed mine from whatever kinda grease-like fluid was in it to mobil one 5W 30 and it drives so much smoother. i took the fill plug out of the side and took the shifter boot off and then ran some tubing that fit tight in the hole into the cab with a funnel on the end to fill it....then just wipe the end of the tubing and blow the oil through and pull it out....then get the plug in quick before it drains out. its low tech and takes some extra time to fill but it worked fine.
 
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