change it after every 100 engine hrs if you're bored or every 200 hrs if you have a life . Any tiny moisture WILL EVAPORATE by running the engine. a lil condensation in the valve covers? If you can, start the engine and run every other week.. I'm a professional yacht mechanic.. moisture "mixing" with the oil...darren please... if you have fresh oil or old oil, any trace moisture(and we are talking about trace amounts) will evaporate upon running the engine and WILL NOT remain suspended in the oil. puh..leeeez.
oil change Have heard it said oil has an acid effect when it gets old. This is my first post still not sure how this site works
I was referring to my climate. Your in CA not Ontario Canada. Might as well be a different planet. Dont mind me though I likely dont know of what I speak. Trace amounts? Yeh right. Not up here. Scooper has to be the judge based on his climate and situation. Next time I have a problem with my Yacht in the scorching sun I'll be sure to look you up though. Thanx. FYI condensation/water mixed with engine gases creates acid in the crankcase. Big problem in THIS climate and Auto 101 for us.
I always use that. But I usually drive the car more. It has been a bad year for driving without a/c. We had 2 months of 100+ temperatures nearly every day. It has just been too damned hot to do anything outside. Usually, I would put AT LEAST 500 miles on in a summer, sometimes upwards of 1000-2000 miles. Just not this summer. We only took the boat out 3 times, when we would usually go at least once every weekend. It has been THAT bad... And to answer the "climate" question...it has been VERY dry here this year. Worst drought in Texas history.
I agree with Don. lol sounds like your oil is like a battery made out of a sponge, full of acid and water jk. As dry as it was I went through more air filters. Seemed that they collected more dirt than in the past.
Oil gets acidic from use - the nitrous oxides produced during combustion form a weak sulfuric acid. It takes from 200 to 400 hours (depending on compression and type of usage) for the acid to get to the point where it will start to eat bearings. Put some time on the oil with the engine warmed to keep the water out and change the oil when it gets bad.
Ok ... to take this a step further .... About 4 years ago, when I thought I may fire mine up for the first time in a while, I changed the oil and filter, pulled the plugs and put a bit of Marvel in each cylinder and proceeded to turn the motor over with a breaker bar, a couple of revs per day. It was never run. Then I changed course and took the car further apart, and am just coming back around to "it may be a driver again" in the next few months. Anybody here still think this oil is still OK? ... keep in mind, Florida is about as humid as it gets.
Captain Comet, as mentioned above, the oil reacts with the water only after several hundred miles of running. If you start it up, the humidity/water should burn out quickly, once up to running temps. Based on the previous posts, I would just start it up on the existing oil.