I have no expertise concerning the use of 60 wt oil, or for that matter any oil. My behavior for any vehicle has been to follow the manufacturer's recommendation. The owner's manual for my 1991 Volkswagen Vanagon GL Campmobile recommends 20W-50 oil over a wide range of temperatures. I have finally switched to 15W-50 Mobil 1, and pressure at high temperatures seems a little better (doesn't drop below 10 psi according to my gauge) on long high ambient temperature runs. It also seems to drop to around 40 psi more quickly from around 70-80 psi at very cold startup compared to when I was running the 20W-50. Is there a reason, despite the owner's manual recommendation, that I should be leery of multi-grade oil with the higher number being 50? My vehicle only has 189K miles on the waterboxer, it doesn't use oil, and once I got the cooling system and the oil cooling system sorted out, pressure seems fine. When I first got the vehicle, was even more ignorant than now, and hadn't yet done the cooling system and oil cooler work, pressure was low on long runs at high ambient temperatures. |
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