Originally Posted by Ignatius
Quote
Reason 2: Anti-foaming. Also referred to as air release, the oil has to release air pockets generated during friction and movement. Rotella is not very good at this, and that's OK when you are running a Detroit Diesel with a 2100RPM redline or even a 6.7 Powestroke with a 3400RPM redline (where the anti-foaming starts to become a bigger issue), not so much when you're running a
Subaru FA20 with a 7400RPM redline. Under extended use, this can eventually aerate the fluid enough to cause catastrophic failure, or at minimum power loss.
Funny they made reference a Subaru DI engine using Rotella T6. It has been well know for at least 5-6 years that despite Rotella T6's cult following among Subaru enthusiasts that this specific oil does not function well at all in Subaru direct injection engines. Go over to NABISCO and one of the first threads you'll likely come across states this very clearly in the first post.
Most people using Rotella T6 in a Subaru engine are usually doing so in a port injected WRX or STi, often with a cat deletion mod. It has a very solid track record of producing excellent results under those circumstances.
Yeah, I've never heard of foaming issues in WRX's and I've been on NABISCO since way before it was NABISCO. And you're right about the DIT. 2015+ WRX owner's have largely moved away from the old school Rotella and on to ACEA C3 oils. A few folks are still running high SAPS oils in DIT's and most of those are modified (I understand that TGV deletes mitigates intake valve deposit issues). Maybe this person has not really done their homework before making some of these comments?
This is one of my favorite posts here about HDEO's in gasoline engines:
Quote
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.