Just about to change my oil,it's a good roller cam TR engine and was curious what everyone runs in the old girls? It's got 15w/50 synthetic in it but I'm thinking its a bit of overkill and may just run a 15w/40 mineral oil...what ya reckon??

I'm using Valvoline 15W40 and reckon it is better than anything I've used previously I don't have any scientific evidence to back that up though.

It is a mineral oil. Valvoline actually recommend 20W50 for older engines. However I think by "older" they mean "high mileage" rather than old in years. Even thougn mine is 25 yrs old, it has only done about 70,000 km so that is my justification for using 15W40.

There's noticeably less tappet noise than with the Castrol GTX that I used to use.

Valvoline actually recommend 20W50 for older engines.

Used this in my TP and both 4 and 6 cylinder TSs without problems.

Coldy > valvoline ads

https://www.youtube.com/watch?v=15TdOGtH3Dg

https://www.youtube.com/watch?v=33_dxeRuVHc


Tpwagon > Im doing ok for now .....chemo makes you sick, loose weight and hair .

TR engine and TP engine much the same specs all over

. only timing chain set up and rollers with a slight valve dish difference in heads

engine wasnt designed for synthetic oil

the range of oils needed for the TR motor 4 cyl is any of what coldy and mad max is saying

the oil has to suit the current local temp conditions of operations

http://i253.photobucket.com/albums/hh59/magnabuff/magna/viscosity%20oil.jpg (http://s253.photobucket.com/user/magnabuff/media/magna/viscosity%20oil.jpg.html)

I am using penrite 15W-40 semisynth.
Was using 20W-50 prior to that but changed to the thinner oil because one tappet was mucking up badly.
No problem after the oil change (maybe due to the oil change itself or the change to thinner oil???).
Also flushed the lash adjusters after the oil change just for good measure.

Would try even thinner 10W-30 (Canberra weather!) if that tappet was still noisy!

Thankyou all...good to hear your doing OK Buffy...your tougher than a first gen mate! I bought some Penrite 15w40 and will see how she goes...so far all seems just fine! Might go back to the 20w50 for summer,maybe. Cheers guys.