Originally Posted By: vinu_neuro
I'm not married to the idea of using a 30wt, but all the low-P HDEO's seem to be. Some of the high-mileage oils might be good, but without OEM approvals it's anyone's guess how they perform. When you use a product like M1 ESP which is in your G37 that meets Mercedes 229.51, or a Delvac 1 LE that meets 228.51, you know that despite the lower phosphorous the anti-wear performance (along with oxidative stability, piston deposit resistance, etc etc) is still there that you'd get in something like M1 0W-40.
Alas, cost and the higher volatility (surprisingly) of these new HDEO's make them economically prohibitive.
I don't recall if you mentioned in your other threads if you've tried to address the cause of consumption in the first place. Of course, if the vehicle is old and parts (and labour) are expensive, that can get prohibitive, too. And I'm assuming a cat delete in your state is out of the question. I suspect you have emissions checks there. This province does not.
The volatility of these lubes might be higher than we expect, but it's certainly within ACEA norms. While we all like a low NOACK, I don't think we need to get too concerned. As for availability and cost, that's going to take time. The Delo and the Delvac 1 LE are the only ones that I can think of that are close to what you need. You go to something like Petro-Canada's 0w-30 HDEO, and you wind up with way older API specifications and nothing on the ACEA or MB front. Any other 5w30 HDEOs I've seen are similarly dated.
I'd suggest a lubricant tailored for LPG or CNG, since some of those have had lower phosphorous. However, the TBN on them is dismally low, since fuel dilution is never an issue in those engines.
I wouldn't dismiss a HM oil too quickly, particularly if you can get a sensible one at a decent price. Their TBN isn't low, and considering you're going to be replenishing, I don't think you'll have problems. MaxLife and M1 HM at least claim some ACEA specifications. This is for the Prelude, correct?