I only run 5-40 Full Synthetic on my Armada and all my vehicles in the past. I've never had an issue and only changed the oil once a year or whenever 7500 miles hit. As for what brand, Shell Rotella T6 5-40.
Car idles smoother with Castrol it seems.
Penzoil is the only "clean" oil. It's made from natural gas rather than crude oil. So that in itself is beneficial when talking about deposits left in your engine vs other oil brands.
For experience using pennzoil. Really good stuff
I run pennzoil 5w30 ultra platinum. ... PUP is great for direct injected turbo. Anthony (Dmann) told me that PUP 5w30 is the way to go in western PA
I've been using Pennzoil Ultra Platinum since the first change in my 2016. Prior to that, I used it exclusively in my RX-8 that made it to 154k on the original engine.
Ran Redline 5w40 when it became purely a summer car in ~2013. ... Not seals are leaking, no issues of any form. Car has been Cobb stage 2 91oct tuned (OTS, not pro-tuned) almost 14 years, with a Crawford v2 AOS, Killer B oil pickup + windage tray being the only reliability mods, and it doesn't burn a single molecule of oil.
I run 10w-40 castrol gtx been running it for the past 5 years I drive a 2011 wrx
I run 10w40 5100 motul now. on all bikes etc.
Clutch doesn't like the full syn stuff.
I was ordering oil last week to do a change, I noticed that the Mannol was half the price of every other brand.
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