Sponsored Links (Register now to hide all advertisements)
The thermostat would help a lot. It did on my A and especially on the V8 that had a lot of sludge when I bought it 5 years ago. No oil filter but I’ve made it a practice to change the oil every 350-500 miles, done it 12 times now and there’s no sludge that I can feel through the very large oil drain hole. But that doesn’t answer your question....I use Rotella 15-40 in my cars and feel the synthetic might not make any difference. Frequent changes and a warm engine should help. Others will definitely have differing opinions.