I am certain this has been covered but I could not find the posts in my search. What is the general feeling these days on the correct engine oil for pre-catalyst TR's? All of the oil producers have been forced to significantly reduce essential lubricants needed by many older flat tappet engines to meet with more demanding catalyst warantee requirements. This applies to many of the oils recommended for our motors 30 years ago - including Castrol GTX.
Two solutions seem at hand, perhaps there are others:
1) use Castrol Syntec 20-50 made solely for the needs of these older engines
2) use an additive such as ZDDP which replaces the needed zinc and other lubricants needed by our engines.
What is the current feeling on this issue?
Thanks.
Two solutions seem at hand, perhaps there are others:
1) use Castrol Syntec 20-50 made solely for the needs of these older engines
2) use an additive such as ZDDP which replaces the needed zinc and other lubricants needed by our engines.
What is the current feeling on this issue?
Thanks.