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LS engine guys i mean.īut since its for my subaru, i'll try this out. Only thing is that GM guys don't like it much, because they say it makes their lifters chatter. So far i don't see much negative feedback on it, on various car forums.
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I went ahead and bought 2 jugs of mobil 1 EP 5w30 as per your recommendation. I figure if it's good enough for them germans, it's good for import cars. I even bought the dexos 2 motul because i "thought" it was one of the best because of the euro standards. You don't need a higher viscosity unless you're racing etc. OEMs know what viscosity to recommend better than them. I wouldn't worry much about some people on oil forums recommending thicker oils. Typical ILSAC 5W-30 has HTHS = 3.0 - 3.1 cP, although some have a little higher HTHS. Subaru didn't bother to require SN PLUS either. It doesn't provide LSPI protection, but I doubt your TGDI engine has a high-enough BMEP to experience significant LSPI events.
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The ACEA C2/C3 dexos2 oil with HTHS = 3.5 cP you have is OK to use. 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. 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.