Originally Posted by Gokhan
Since they recommend an API SN/SN PLUS/ILSAC GF-5 synthetic 5W-30 for the Subaru WRX or Subaru WRX STI, I would go with a top-quality GM dexos1 Gen 2/Gen 3 5W-30. Either the Mobil 1 Extended Performance 5W-30 or the Mobil 1 Extended Performance High Mileage 5W-30 with its higher PAO content (about a third of the base oil), Group V alkylated naphthalene (AN) content typical of American Mobil 1 oils, and extra antioxidant for extended oil-change intervals is an excellent choice for reducing the intake-valve deposits (IVD) and turbocharger deposits.
The ACEA C2/C3 dexos2 oil with HTHS = 3.5 cP you have is OK to use. It doesn't provide LSPI protection, but I doubt your TGDI engine has a high-enough BMEP to experience significant LSPI events. Subaru didn't bother to require SN PLUS either. Typical ILSAC 5W-30 has HTHS = 3.0 - 3.1 cP, although some have a little higher HTHS.
I wouldn't worry much about some people on oil forums recommending thicker oils. OEMs know what viscosity to recommend better than them. You don't need a higher viscosity unless you're racing etc.
wow so much to learn. I even bought the dexos 2 motul because i "thought" it was one of the best because of the euro standards. I figure if it's good enough for them germans, it's good for import cars. boy i gotta more reading to do.
I went ahead and bought 2 jugs of mobil 1 EP 5w30 as per your recommendation. So far i don't see much negative feedback on it, on various car forums. Only thing is that GM guys don't like it much, because they say it makes their lifters chatter. LS engine guys i mean.
But since its for my subaru, i'll try this out. Thanks again man.
Since they recommend an API SN/SN PLUS/ILSAC GF-5 synthetic 5W-30 for the Subaru WRX or Subaru WRX STI, I would go with a top-quality GM dexos1 Gen 2/Gen 3 5W-30. Either the Mobil 1 Extended Performance 5W-30 or the Mobil 1 Extended Performance High Mileage 5W-30 with its higher PAO content (about a third of the base oil), Group V alkylated naphthalene (AN) content typical of American Mobil 1 oils, and extra antioxidant for extended oil-change intervals is an excellent choice for reducing the intake-valve deposits (IVD) and turbocharger deposits.
The ACEA C2/C3 dexos2 oil with HTHS = 3.5 cP you have is OK to use. It doesn't provide LSPI protection, but I doubt your TGDI engine has a high-enough BMEP to experience significant LSPI events. Subaru didn't bother to require SN PLUS either. Typical ILSAC 5W-30 has HTHS = 3.0 - 3.1 cP, although some have a little higher HTHS.
I wouldn't worry much about some people on oil forums recommending thicker oils. OEMs know what viscosity to recommend better than them. You don't need a higher viscosity unless you're racing etc.
wow so much to learn. I even bought the dexos 2 motul because i "thought" it was one of the best because of the euro standards. I figure if it's good enough for them germans, it's good for import cars. boy i gotta more reading to do.
I went ahead and bought 2 jugs of mobil 1 EP 5w30 as per your recommendation. So far i don't see much negative feedback on it, on various car forums. Only thing is that GM guys don't like it much, because they say it makes their lifters chatter. LS engine guys i mean.
But since its for my subaru, i'll try this out. Thanks again man.
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