Originally Posted by oil_film_movies
Originally Posted by AzFireGuy79
I've been using Valvoline MaxLife Synthetic 5w30 for a short time in a Toyota 2UZ-FE (4.7 V8), which has had immaculant maintenance. I'm curious about trying Castrol Extended Performance and going 10,000 miles or annual coupled with a fram ultra. Seems like a very robust oil, but not many followers here. Thoughts appreciated!
Its probably good oil, but Castrol never certified to the high dexos1 spec, while your Maxlife is. Also, Mobil 1 Extended Performance and Annual Protection are dexos1 certified. Its important to me because that means we know it passed a bunch of additional tests on top of SN GF-5. Good choice the Fram Ultra, great filter there.
He has a Toyota, so Dexos is irrelevant. I can't speak much for Castrol EDGE Extended Performance but if it was me, I'd use the "real" Castrol synthetic aka German Castrol in either 0W-40 or 0W-30, they're the only synthetics from Castrol to get excited about, in my opinion. I've used them in the past with great results, just harder to find so I'm sticking with Mobil 1 in my Tacoma.