Originally Posted By: 02s4audi
Originally Posted By: bluesubie
Any 0W40 from Wal Mart; Mobil 1, Castrol, or Pennzoil and you can run any of them for 5-6k miles.
I see you use m1, would you recommend m1 or castrol more? Also I've seen your name pop up a few times here and naosic refering to oils. Is there a reason you didn't suggest rt6?
I actually haven't used Castrol 0W40 very much so I don't really have an opinion one way or the other.
As for RT6, at the time it was gaining popularity among Subaru enthusiasts, I was running boutique oils like Motul, Amsoil, and Red Line (and before that the green and gold varieties of early German Castrol 0W30). And now that 0W40 is more popular in Wal Mart compared to a few years ago, I just went with those mainly because I like buying oil in 5 qt containers instead buying one gallon plus one quart.
I also feel that much of the Subaru community went with RT6 merely based on viscosity and ZDDP levels without understanding that there are different options out there for a robust oil and without understanding that the HTHS levels in ACEA A3 oils are in a different ball park that GF5 oils. Many people also do not understand that ZDDP is not the only anti-wear additive available in oil and they automatically assume more ZDDP is better. Mobil 1 still gets a bad rap by a lot of Subaru enthusiasts that seem to lump experiences with Mobil 1 5W30 to all Mobil 1 oil, but they are usually just running the wrong viscosity for their application.
Here's a good history of Doug Hillary's use of HDEO's in petrol cars:
Quote:
Hi,
Dennis - I first experimented with HDEos in petrol engines in Europe in the early 1960s when working in Copenhagen for Caltex-Chevron in a Technical position
This was prompted by various experiences, excessive engine deposits in certain engine families, "poor" petrol engine lubricant standards and motivated by the results coming out of MB and Porsche. Porsche FF in the 1950s-1960s was a Shell HDEO
I've used HDEOs in petrol engine ever since - for nearly 50 years!
This was confirmed by extensive lubricants field testing for a number of Oil Companies over several decades
Modern appropriately classified lubricants as recommended by the engine's Manufacturer have almost effectively negated their use in petrol engines today IMO
My dealings and comparisons of HDEOs started in the early 1960s. I was always motivated by the MB and CAT lubricant specifications at a time when very few existed. I've always found that Shell and Delvac products produced the cleanest engines as the end result
https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2716911