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Originally Posted by jwk316
This post is to give me some insite on which oils can go back and forth with each other. For instance, in the winter its better to run a thinner oil and summer its better to run a thicker oil. I changed my car over to synthetic at 106k miles(i know not a good idea). It had burned oil before this and now it still burns oil, but I think I made the mistake of going with a fully synthetic instead I should have gone with a blend or a high mileage formula. Does anyone know if I can go from my synthetic to a high mileage oil and does high mileage oil contain a blend of synthetic and conventional oil? It is just confusing and I heard at one point in time that once you go synthetic you cant go back... is this true? I currently am running an amsoil 10w30 full synthetic oil that goes for a year service or 25k miles for new vehicles or for vehicles with 75k or higher 6months or 15k miles. Thank You anything will help.
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YEShttp://www.automotiveforums.com/vbulletin/images/smilies/grinyes.gif High milage oil can be synthetic, or blend, or conventional. You can switch to whatever from whatever. With the car burning oil, save your $$ and stay with conventional. I suggest you goto a 40 grade. Valvoline, Castrol, etc.
The thicker grade helps the older engine run better. I use 15w40(Delo 400) in my old '91 Ford and '74 Chevy. I live in California and the weather is mild.A Wisconsin man told me most people use 10w30 in that part of the country.
There is a ton of information, testimonials, specs, out there. Very confusing unless you are a lubricating engineer. Use a good filter NAPA gold, K&N. Synthetic will still collect carbon deposits and metal bits over time so to get your $$ worth go at least 7500 to 8k between changes. 25k is extreme I wouldn't do it.