Ive been askin around and I’ve been told that with the old seals on motors that detergents in synthetic oils make them leak. So what synthetic oil has low or no detergents and is still good??

I just stuck with conventional Valvoline. 30k mile bone stock motor..

When I switched to Mobil 1 in my 87 with about 40k Miles it started weeping.. Nothing urgent or noticeable on the dipstick, but there were little half dollar spots on the garage floor.

I only drive around 800 miles/year on the 88 so the oil doesn’t even really get dirty..

I use a really good WIX filter though.. I was always told the filter is the first thing to break down. Having 10,000 mile synthetic oil is great, but the low end filters can’t keep up.

I’ve been running Mobil 1 regular and now High mileage 5w-30 for 2 years on my l98 GTA with 81,000 miles and no issues with leaks.

I agree.. I’d run synthetic if I was pushing the engine and just fix the leaks, but with a low mile car from the 80s that doesn’t leak now, I’d rather not since I’m just cruising around.. If I end up getting leaks that need to be fixed I’ll switch to synthetic at that point..

Good to know the Amsoil filters are rated so well..

All small block Chevys will leak eventually.. as my BMW and Porsche friends always remind me..