Cadillac Catera and Cimarron Forum Discussion, Changing from synthetic to regular oil in Past Cadillac Vehicle Discussion; I just bought a 1999 Cadillac Catera and I was told that it uses synthetic oil. Well it is time ...
I just bought a 1999 Cadillac Catera and I was told that it uses synthetic oil. Well it is time for an oil change and I was wondering if I can change and use regular oil, as it cost almost a $ 100 for an oil change with synthetic oil.
Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
MD Eastern Shore - Kent Island
Re: Changing from synthetic to regular oil
Use whatever oil floats your boat, as long as it's in the recommended viscosity range for your engine. Conventional, "blend" (what proportions ?) or synthetic is perfectly fine and none of it will leak out of a bad seal any faster than any other.
I always used synthetic blend 10w30 but this time trying out the full synthetic. Also in the owners manual I believe it says to use 5w30 for winter and 10w30 for summer.....don't remember exactly though.
i have 2000 sport, since i got it i been using only Castrol GTX high millage - non synthetic, in my manual synthetic not recommend to use, i even called to my local dealer and he told me the same thing, that's sounds weird due to fact that older models are running on synthetic and why would GM chained filter from spin-on to canister type on 2000-01 models, All Cateras have same engine !!!! WHY??? i personally not recommend to swap oils from synthetic to regular and back, why ? well think about fact that your engine was running regular oil for 13 years, same stuff all the time , same chemicals for 13 years and u throwing in to it some thing else..... To late to do swap like that. i got my car when it was 126k on it, that's to mush to do switch like that, my friend owns 2010 Honda Civic that's runs on regular, but he switch to synthetic. not a problem when u have like 30k on it, not 130k..... synthetic oils not create oil leak, it makes seals leak more if they already was leaking.
i personally not recommend to swap oils from synthetic to regular and back, why ? well think about fact that your engine was running regular oil for 13 years, same stuff all the time , same chemicals for 13 years and u throwing in to it some thing else.....
An engine is an inanimate object, it does not "get used to" things. You can change back and forth m as often as you'd like, at any mileage.
it makes seals leak more if they already was leaking.
Sorry, not watching a youtube video to learn anything about oil.
The only possible way synthetic oil could possibly worsen a leak, is if it's higher detergent level cleaned built up crud away from a leaking seal, but that is very unlikely, and it doesn't make the seal itself leak any more. If an engine running conventional oil for 150K miles, had the oil changed on schedule, there will be no such buildup, and switching to synthetic will have absolutely no effect on leaks.
WOW, what a lot to absorb. I don't have a owners manual for my 1999 Catera. Does anyone know if there is a difference between using 10W30 synthetic and 5w30 synthetic. Not sure which one to choose from.