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Forum: Diesel Discussion

07-03-2011, 11:48 AM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

Dunno if the MT in my 91 BMW is THAT much...

Dunno if the MT in my 91 BMW is THAT much different from your w123. Those E30 cars were designed in the late 70's/early 80s versus early 70's like a w123. Was there much change?

Just relaying my...

Forum: Diesel Discussion

07-03-2011, 11:17 AM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

I do. The only commentary Ill add is that based...

I do. The only commentary Ill add is that based upon my experience using redline in BMW gearboxes, they shift real well at first, but the fluid causes them to get notchy real quick. I found that...

Forum: Diesel Discussion

07-03-2011, 11:08 AM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

For manual transmissions, current MTL GL4...

For manual transmissions, current MTL GL4 viscosites are:

1. ATF Series - Type; 6.5 to 8.5 cSt (Equivalent ATF viscosity; Note: ATF additive package is weak compared to most GL 4's)
2....

Forum: Diesel Discussion

07-03-2011, 10:51 AM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

Motor oil does NOT belong in a differential,...

Motor oil does NOT belong in a differential, period.

Forum: Diesel Discussion

07-02-2011, 03:54 PM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

Time to learn about oil, friend. The add packs...

Time to learn about oil, friend. The add packs in M1 10w-40 (which is a high mileage oil, BTW, not that there is anything wrong with that), do not carry recent diesel specs, which would be superior...

Forum: Diesel Discussion

07-02-2011, 03:24 PM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

M1 10w-40 isn't the right spec for the...

M1 10w-40 isn't the right spec for the crankcase... There are better products for the engine. Same for the transmission. And if you're putting m1 10w-40 in the diff, wow, just wow...

Forum: Diesel Discussion

07-02-2011, 01:15 PM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

The add pack dispersants are acceptable for...

The add pack dispersants are acceptable for putting into a transmission specified for motor oil. That is not a consideration.

However there are chemistries that are more suitable for transmission...

Forum: Diesel Discussion

07-02-2011, 01:10 PM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

No, too high an ash content. Will put abrasives...

No, too high an ash content. Will put abrasives in the combustion chamber.

Forum: Diesel Discussion

07-02-2011, 01:08 PM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

Not really. The HDEO add packs are fine and...

Not really. The HDEO add packs are fine and compatible, and the slight cold flow viscosity change (there will be none at operating temperature) should make no difference other than when it is less...

Forum: Diesel Discussion

07-02-2011, 12:57 PM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

differential oils may not have the right...

differential oils may not have the right additives to prevent yellow metals wear in the bearings of the gearbox. GL-4 type additives are necessary.

If an 80/90wt fluid is necessary, the best IMO...

Forum: Diesel Discussion

07-02-2011, 12:34 PM

Replies: 37

15W-40 in 4-Speed Manual Transmission?

Views: 5,387

Posted By JHZR2

Id try to use a proper, purpose-specific fluid...

Id try to use a proper, purpose-specific fluid for that application. Synchros and other things will work better as a result. What does the FSM recommend?

Use the rotella to top off crankcase oil...

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