You should be able to use the same grade of oil as is used in the engine,
detergent or not is the issue, from a longish list. Whilst you can
reputedly use other lubricants in the gearbox and OD (which share it of
course) if it doesn't work with 20W/50, 10W/40 or whatever there is
something wrong with it that an alternative *may* alleviate. But if it does
alleviate a problem you are only getting round it, not curing it.
The OD includes low pressure (for when OD is disengaged just to provide
lubrication) and high pressure (for when OD is engaged to change the ratio
*and* lubricate) relief valves so given everything else in spec it just
isn't that sensitive to oil grade.
PaulH.
----- Original Message -----
> ... I
> did a lot of reading, and quickly determined that I was not supposed to
> use a detergent oil. I couldn't find any non-detergent 20W50, so I
> converted to the heaviest (non-gear oil) non-detergent oil I could find,
> which was straight 30 weight. I understand the overdrive system and how
> it engages pretty well, and it makes sense to me that 30 weight is not
> heavy enough to keep the overdrive engaged well - especially if there are
> any iffy o-rings.
|