Wich gear Oil ??And other oil questions!! - Alfa Romeo Forum
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Help Wich gear Oil ??And other oil questions!!

I'm soon planing to change Oil in gearbox ..What type is best for Alfa 33 1.5. year 94'.
In manual it says Agip Rotra MP 80w/90 or Tutela W90/M-DA (GL-5 specification)
Do I stay whit this or is better to go for Full Synthetic like:
Agip ROTRA LSX 75W/90,
Castrol 75/90 Synthetic,
Liqui-Moly SAE 75 W-90

And another question last time I put Agip Sint2000 10W-40 half synthetic in engine,
Before that I used mostly Full Synthetic ,Shel 5W-40,Castrol RS 10W-60.
Since Agip is half synthetic(also 2-3 times cheaper) is that bad for engine or doesn't matter as soon as is frequently changed.

What type you use in your 33's.???????????
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Re: Wich gear Oil ??And other oil questions!!

Not sure about 33's specificaly but a well respected Classic Car Specialist in the UK recommended using fully synthetic Oil in the Gearbox of my Giulia. His preferance was for Valvoline grade 15-50, or there abouts. He recknoned it made no sense to use heavy Gear Oil in the Gearboxes, because the Engine Grades give much better protection from cold. Be careful it doesn't run thro the seals tho, because it is much thinner, he also said fast changes when hot may be a bit noisy but from cold they will be better.
If you do a lot of short trips this is an advantage.

Swapping to semi synth, after full synth shouldn't make much differance IMO.
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Re: Wich gear Oil ??And other oil questions!!

This thread makes me think... What did the people in the garage where I got my gearbox repaired last summer use for my box!

I think I'll change the GB oil too
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Re: Wich gear Oil ??And other oil questions!!

A word of warning.

I once changed the gear box oil in my Sprint from normal gearbox oil to fully synthetic. Within a short space of time the gearbox failed !!!

I think the normal gearbox oil and the synthetic oil were not compatible and I had not removed the sump from the gearbox to get the last of the normal oil out.

This was about 8 years ago and oils may have changed a bit since then
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