Aug 28th, 06, 08:49 PM
The following is a response from Valvoline to an email I sent back in April.
The consensus in the industry is that the current chemical limits of the GF-4/SM category is still sufficient to protect all "street" engines, including older flat tappet foller engines. The engine tests required for a GF-4/SM products is just as severe as the older, higher ZDDP allowed category. For the special applications (aggressive cams, high HP racing motors, ... etc) where the customer needs more ZDDP protection, our NON-GF-4 products still contain the higher levels (such as VR-1 and "not street legal" racing). Valvoline conventional motor oils are still perfectly fine for the older flat tappet applications and will be completely safe for protection........
Valvoline is right, there oils will work fine in old engines. T/C Steve
