![]() ![]() Prestone Fully Synthetic Motor Oil is a specially blended from a 100% mix of P.A.O. Prestone Fully Synthetic Motor Oil SAE 5W/40 from Honeywell International Inc Also, older vehicles tend to have more wear in the tolerances and the (slightly) thicker oil may compensate and slightly increase compression levels, which is why most high mileage oils tend to run thicker in grade. Secondly, oil temperature is not the same as the water temperature and there is a fluctuation. However, I think the assumptions are regarding newer cars. The Oil U stuff is not gospel, although I personally agree that thinner is generally better overall. I'd just go with the 5W-40 and call it a day. A thicker oil won't get down to the right viscosity at the engine's operating temp. stuff that there is never a reason to go for a thicker oil, since the cooling system is supposed to maintain a specific temp in the engine and the manufacturer recommend oil will have the right viscosity only at that temp. I got the impression from reading the Oil U. I figure since "winter" is starting and 99% of my driving is short hops in the city the 5W40 Full Syn might be good for me, and then in spring switch to something cheaper like a no name 5W30 dino. On autozone it says either 5W30 or 10W30 - they're out of the cheapish Prestone SynBlend 5W30, the next cheapest thing that looks decent is a Prestone 5W40 Fully Synthetic. One more thing, what's the deal with High Millage oils for older cars? Anything special about them that I should go hunting for one? I live in a generally hot arid country ( might get down to freezing two weeks a year ) and do mostly short city drives.Īutozone site recommends various 10W30's, but after reading the Oil University stuff I was figuring why not a 5W30? What's worth putting in mineral, blend or full syn? I've seen a Prestone 5W30 syn blend oil which isn't too expensive, a full syn German oil which is three times the price, and I'm pretty sure I can pick up Motorcraft at the local Ford / Mazda dealership, but don't know how much it costs. Previous owner was putting some generic 20W50 oil in it, don't know what the original owner did. Also some weird idle issues, but I don't think that's relevant to this ( correct me if I'm wrong ). However, after putting it up on a lift we noticed an oil leak bottom passenger side of the engine which I'm assuming must only act up when the car is running. There's no noticeable oil stains under the car when it stands for extended periods. Previous owner says it was using about 4 liters of oil in six months without any noticeable oil leaks ( although when I checked the oil it looked over full ). The head and rings were done on the car a few years ago. I'll try and provide as much info as I can as per the sticky oil post. I just bought a Manual 97 Mazda Lantis 323 1.8L DOHC 16 Valve BP which in the USA seems to be labeled a Protege. ![]()
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