Allow me to start by offering my thanks for taking the time to produce such an easy to follow and informative article on engine oil. Using your information I changed from 20W 50 dino oil in my 1977 308 GTB to Mobil One 0W 40. The results have been fantastic especially at start up where all previous noises are gone.
Robert, Toronto, Canada
Mr. Haas, thank you. I have raced motorcycles and cars for years. I will freely admit to subscribing to more than 1 of the "myths" detailed in your wonderful dissertation. If it is clear enough for an old dog to understand and change his ways, it’s a well written explanation. I have read every chapter end to end. Again, thank you.
John, MA
I've been trying to figure out the best oil for my 328 for the several months that I've owned it. I've read all the posts, checked the manual, changed oil with different weights a couple of times, monitored pressure and temperatures, fussed over correct levels etc. Now, with a sense of relief, I can settle with a decision with some confidence. It will be Mobil One 0w40. I tried 15/50 and the pressure was a bit high according to the manual, and I've tried 5/30 and it was a bit low-though both in the ballpark.
Lawrence, Calgary, Canada