Hi,
I'm a new member and glad to be here.
my question is about synthetic oil. I would like to change to 5-20 syntech or equivelent in my 2007 Santa Fe. I can't find any where in the manual that mentions that this is bad. It is the 3.3 engine and I have had no problems with it. I just want to make it better and last a long time.

Thanks ahead of time.

 

I've been using 5w20 Mobil1 in my cars for years with no problems. 2004 Tiburon 2.7L, 2006 Tucson 2.7L and my wifes 2006 Kia Sedona 3.8L.

 

Thanks,
I appreciate the info..

 

Good luck with that, a lot of mechanics will tell you not to do that. It should be ok, but then I've seen people do that and get a severe valve tap afterwards. Depends on how clean the inside of your motor is.

 

^^^ Untrue. Check your owners manual, Hyundai says it's OK to use 5w20 in the 2007 Sonata 3.3L:

 

Nova, I'm not talking about oil weight, I'm talking about the synthetic loosening gunk and messing up your motor. That's the problem with switching from dino to synthetic. That's why mechanics tell you not to do it. Remember this guy:

https://www.hyundaiforum.com/forum/s...ighlight=mobil

That's why it's best to stay with dino oil if your engine is old, switch to synthetic if you car is still new, and the crankcase is clean.

This guy will probably be ok, but it's best to warn him of the danger and let him decide.

 

That is a myth. Synthetic oil does not cause that problem. Engine flushes cause that problem. Never do and engine flush, but there is no reason not to switch to synthetic oil.

 

I have a 2007 also and I have use Motul synthetic in it from day 1 and I 16,000 miles on it and I have not had any problems out of it.

 

I think the warning was given on the premise that
synthetics have more detergents and additives
in them that could cause it to clean the engine more
so than conventional motor oil, thus having a
similar effect as a motor flush, although on a much
smaller level.

Personally I don't know if that's true or not, but I've
heard it before. All oils nowadays have quite a bit
of detergents in them and keep the engines pretty
sludge free if you change the oil and filter as
recommended.

I know people who have done the switch with over 90,000
miles on their engines with no problems. I plan on doing
it with my Tundra which has 96,000 miles on it. Of course
as I mentioned, I change my oil and filter religiously, so
there shouldn't be any or very little sludge built up.

 

Hey Guys,
I appreciate all this info.. My santa Fe with the 3.3 engine in it has 14,500 miles on it and the oil has been changed every 3000 miles. We've owned it since it was new. I believe it is clean inside. you've given me the confidence to change over to synthetic. Thanks again..