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The new mobil1 5000 is pretty awesome. Its a heavily refined Group III oil. Pretty bad *** basestocks. Its actually considered a syn by some "other" oil companies, but technically its just seriously refined dino oil.
good old Castrol GTX is excellent, there's a reason while all other oil makers keep putting 'New!', 'Improved!' labels on their dino oil offerings, Castrol just keeps chugging along with the GTX. Castrol knows dino oil formulation :D
It is hydrotreated, so they claim that equals synthetic - it doesn't.
My refinery is actually called a synthetic crude refinery, because all it's feed is made in the oilsands, not pumped up like "dino".We hydrotreat over 100,000 barrels of oil per day, but none of it qualifies, in my opinion, as 'synthetic'.
Similar question from a new guy: The manual says 5W-20. Isn't 5W-30 at least as good. Why does the manual seem to insist on 5W-20?
Don't know why does the manual say 5W-20 but I heard in Europe the spec says 5W-30. The 5w-30 should be just fine.
There is no reason to freak out like several people did if 5W-30 is used by the dealer. Sure they should stick to what the manual recommends but there won't be any harm done.
Castrol GTX 5w-20 for me too. Loaded up on it as it was on sale recently.
RB Fr/Rr Sway Bars, RB Fr Sway Bar Endlinks, RB Springs, RB Spark Plug Wires, RB Oil Cooler Screens, RB REVi Air Intake with Ram Air Duct, Centerforce Clutch, MS Fr. Tower Shock Bar, MS Rr Strut Bar, Goodridge SS Brakelines. Hawk HPS Brake Pads, SR Motor. Flywheel, Agency Power Pullies, RP Super Cat, Stern 19" ST 2 Touring Wheels, Falken FK452 Tires, Axial Flow Short Shifter, JIC Titanium Exhaust, Kyokugen Alum. Lugs, PWR Alum. Radiator, Greddy Oil Pan, & more
For dino oils I like Castrol and Havoline only. Both of those oils are formulated very closely to each other. They do not contain quite as many additives as the other oils and generally (unless they have been reformulated and I don't know it) have lower ash content which leads to less carbon buildup.
For sythetics I like Royal Purple, and Amsoil for their good stability and low ash.
The lower number in an oil such as 5W20 is the weight of the oil. In this case it is 5. The higher number (20) is what the oil behaves like when hot. To do this the additives do some weird stuff and bond together in longer molecular strings. The farther the high number from the low number, the longer these strings. Don't necessarily think this is a good thing. The best thing is an oil that maintains or stays very close to it's original weight. They are more stable and have less potential to break down. I personally use straight 30W dino oil when breaking in an engine due to it's consistency. 5W20 is a gap of 15 . 5W30 is a gap of 25. The 5W30 oil has longer molecular bonds and I don't like this. Just remember that all of these oils protect equally well and outside temperature has nothing to do with it since the engine is hot regardless of what the outside temperature is.
Valvoline??? Someone is going to use an oil in a rotary engine that is named after an engine part we don't even have? Wow that's scary!!!
you might as well of asked what color people prefer :p
as a 45 yr old gearhead-mechanical engineer-racer it never ceases to amaze me how much people continue to over-****-ize motor oil Bobistheoilguy is a perfect example of how to capatilize on people's fears and beliefs, as are all the conditioners, additives, and now marketing schlock from the oil manufacturers themselves who have come to realize they can capitalize on the value-added mentality too.
Just get any general brand oil in the general recommended viscosity range and follow the general maintenance schedule and you won't have any problem. It really is that simple
I personaly feel that a low ash oil is the only alternative in the rotary as we inject it into the combustion chamber. Carbon buildup can be a bad thing in a rotary. Check out some of the auto stories of carbon lock and engine replacements from carbon buildup.
well looks like i'm gonna be going back to the Castrol camp for a while, just picked up a case of Castrol GTX 5w-20 for $17 at Advance Auto (Advance Auto has a sale til Fathers Day on Castrol GTX for $1.48 per quart)
thanks rotarygod for reminding me of the ash issue, as that is quite relevant to rotary engines, hence why Castrol got my money this time around
picked up 3 Purolator PureOne filters at the same time too :D
on June 7, 2004, a Mulligan was born
and on July 29, 2009, it was gone (from me at least)
Your car isn't going to die or anything from using Valvoline. Don't worry about it. I'm just very strict in what I personally like and use. I only use Wix oil filters. We need our own oil line for rotaries (yes I know about Idemitsu) called rotoroline just to be fair.