I ran motorcraft for like 70,000km's and switched to amsoil 5w50 after that.
Mileage: 70000 km
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I have been told the same by Blackstone on my cars, though I still do it once a year given the cost is <$75. However, I do follow their advice on intervals, after once being a 5,000 mile interval guy. On all three of our cars, using Castrol Edge 5W-20, I've repeatedly gotten analysis that tells me that, at 7,500-10,000 miles, the oil is still performing as intended.
Pros: oil performing as intended
Vehicle:
Ford Mustang
Ive owned four 5.7s starting in 2005.
Changed all of them with 5w20 full synthetic, no real allegiance to a brand, but always a major brand (Mobil1, Valvoline, etc); typically 5k - 7k miles between changes .
2005 had 250k , burned no oil, died when it hit a tree
2006 had 240k, would use 1/2 qt over 5k miles after about 225k.
2013, traded in with 225k, burned no oil.
None of these ever had a valve cover off. I purchased the 06 and 13 new. The 2005 I purchased with 100k on it.
The 4th is a 2021 with 35k on it. So far, so good.
Pros: high mileage, little oil burn
Cons: some oil burn in one
I've been running 5w30 Mobil 1 full synthetic on my 03 hemi. 238k miles and still running perfect with no tick.
Pros: running perfect, no tick
Mileage: 238000 km
Mobil 1 ESP has specs very close to Subaru Japans own Pleiades oils. Its got loads of great certs, is widely available, well priced and highly regarded by loads of people.
Pros: great certs, widely available
Vehicle:
Subaru
I've had good luck with Castrol for several years in two WRXs.
Pros: good luck
Vehicle:
Subaru
Ultra platinum 5w20, in the summer when I’m towing my boat a lot I’ll use 5w30 ultra platinum. That’s about it. The key thing is oil changes every 5k, do not do the 10k oil change interval
Pros: good for towing
2014 1500 with no tick (85k miles). New to me truck and I’m running Pennzoil ultra 5w20 with a Royal purple filter. I might switch to the redline but the PUP was more accessible to me. In theory I live somewhere it could be super cold this time of year but it hasn’t. Depending on when I do my next oil change I might do the 5w30 if it’s going to be hot for awhile.
Edit to say that 5k oil changes for me max. I did my first one at 4k because I didn’t know what the engine had in it and wanted to get something good
Pros: no tick, accessible oil
Mileage: 85000 km
I use Penzoil Ultra platinum 5w20 and a Mobil 1 filter. No issues so far, but I'm just closing in on 100k miles.
Pros: no issues so far
Mileage: 100000 km
I used Amsoil 5w40 European Car formula or Gulf 5w40 Formula G in my A6 previously. Technically Amsoil doesn't have the have the VW 502 00, 505 00 certifications so I think I will start using Gulf Formula G or GX exclusively in my R, either the 5w40 or 5w30 grade.
Cons: Amsoil lacks VW certifications
Vehicle:
Audi A6
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