With Castrol Formula R, the 0w-40 is a true synthetic like Mobil1 (PAO type) but the cheaper 5w-30 is a hydrocracked, which is a mineral oil that is broken down to the desired viscosity. While it is a synthetic because it has been altered, the starting material is still mineral oil!
OKies, guys i just serviced my car to Honda's FEO. was using magnatec 10W-40, so will let you guys know how it goes after a few days of hard driving!!! I just came back from sydney and yeah Hit 90K kms on the clock so yeah. I service my car every 10K and oil change every 5K. Oh and Plus down here in Melb HONDA FEO is like 35 Bucks Its like WTF Grrrr.
In the end, changing your engine oil often is much cheaper than a new engine.
0w20 oil is designed for cleaning out the engine at idle for xx minutes between oil changes. In other words it's used to dislodge all the crud in the engine, and not designed for normal engine use.
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