
Originally Posted by
niky
Well, Royal Purple also reportedly does well on another test which detects loss of viscosity after heating (a test done by AMSOIL to tout their superior strength)... both Royal Purple and Amsoil lose a tiny bit of viscosity due to heat, whereas some other synthetics (including Shell Helix Ultra) lose a heck of a lot (so my 5w40 ends up being something like 5w30... or less... as indicated in AMSOIL's test).
I've noticed over the past two oil changes that there's no oil consumption or that oil consumption is nearly un-noticeable when the oil is new, but once past 4000 kms, my Helix Ultra starts getting lower and lower. My first interval with Helix Ultra only lasted 6000 kms. I didn't dare take it any further because it was already 1 liter low. Had the engine checked for compression... compression was good. After the oil change, no consumption in the first 3000 kms again... then after 4000, it started eating again. I am officially sick of this stuff.
Hear that, Shell? I love V-Power. I'll buy your gear oil... but Helix Ultra 5w40 just plain sucks!... it's nice for making power, but it's just waaaaaaay too thin over time.
It's normal for your car to start drinking the oil once it gets dirty enough, but I was assured that Helix Ultra was good for a 10,000 km interval! I feel kind of cheated. :mad:
The only negative against Royal Purple in AMSOIL's test (obviously, AMSOIL has to come out on top... it's their test... :hysterical) is the size of the particulates suspended in the oil after a certain amount of time. But I believe this is more due to the Synerlec additive (calcium particles ba?) that are suspended in the oil. Anyway, I don't plan on doing greater than 5000 km intervals with the oil.
Also note that Royal Purple didn't get top marks in the test posted in the first page... which means it's not an advertisement for RP, either.