Here's the scoop on Castrol GPS vs. R4 vs. Mobil 1 MX4T vs. Mobil 1 Racing 4T
Castrol GPS is a synthetic based motorcycle oil. Per Castrol, it is NOT a full synthetic and per API guidelines it is at least 30% synthetic compounds.
Castrol R4 is a fully synthetic 4 stroke motorcycle oil.
From what I could tell on the product data sheets, the real difference between these 2 oils was the low Temperature (ºC) cranking viscosity, cP typical
5150 for the R4 vs. 7000 for the GPS (a delta of 5 degrees C between the 2).
Mobil 1 MX4T WAS a fully synthetic 4 stroke motorcycle oil. It is no longer being made under that label. The new label is Mobil 1 Racing 4T (or 2T for 2 stroke cycles).
How did I find this out? My local Suzuki stealership told me that Wal-Mart pulled all the Mobil 1 MX4T off the shelves because of quality problems. I spoke to Mobile directly and they said that they only changed the name of the product; the formula has not been changed.
So.....I ended up getting 3 more quarts of Mobil 1 MX4T (at Autozone @ $7.99/qt.) to do the job. Whew!
Castrol GPS is a synthetic based motorcycle oil. Per Castrol, it is NOT a full synthetic and per API guidelines it is at least 30% synthetic compounds.
Castrol R4 is a fully synthetic 4 stroke motorcycle oil.
From what I could tell on the product data sheets, the real difference between these 2 oils was the low Temperature (ºC) cranking viscosity, cP typical
5150 for the R4 vs. 7000 for the GPS (a delta of 5 degrees C between the 2).
Mobil 1 MX4T WAS a fully synthetic 4 stroke motorcycle oil. It is no longer being made under that label. The new label is Mobil 1 Racing 4T (or 2T for 2 stroke cycles).
How did I find this out? My local Suzuki stealership told me that Wal-Mart pulled all the Mobil 1 MX4T off the shelves because of quality problems. I spoke to Mobile directly and they said that they only changed the name of the product; the formula has not been changed.
So.....I ended up getting 3 more quarts of Mobil 1 MX4T (at Autozone @ $7.99/qt.) to do the job. Whew!
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