What viscosity and type of oil does hyundai recommend we use in our engines? (think I read somewhere it was semi-synthetic? couldn't find it though)
and what kind of gear oil for trannys? (read that royal purple 75/90 is smoothest in the tranny, i think gary said it..anyone else using this?)

or what are you all using, i think it's time for a change..what's the best for our tibs?

 

Not sure what is recommended. For viscosity, i'm sure it depends a little bit on climate. I'm using Mobil 1 10W30 Synthetic, & Redline MT90 75W90. No complaints. fing02.gif

 

Not sure on the Tranny, haven't had it changed in the time I have owned the car. Engine Oil I am running 10W30 Full Synthetic, not sure of brand (whatever my dealership uses)

 

check your owners manual, and you may want to consider weather and altitude while choosing oil. definitely mobil 1 pure synthetic, its the best. as far as viscosity and such, do a search on the forums, i recall it being discussed before

 

i swear hyundai recommended semi-synthetic..??
or no?

doh! i didn't even think to look in the owners manual..good call.

i guess viscosity definitely depends on climate and temperatures, i usually stick with 10/30 regardless...i guess i mostly was wondering what type, mineral, semi-synthetic, or full synthetic. and also what you guys were putting in the tranny. the redline/lucas combo is popular but i was wondering if anyone had tried royal purple?

 

I'm using non-synthetic 5w-30 right now. 10w-30 in the Summer. I'm still planning to switch to synthetic eventually. if you're in WI, you could probably even go with 0w-30 in the winter for better engine protection.

In the tranny I currently have a semi-synthetic GL3/4/5 75w-90 that's safe for yellow metals. I no longer add Lucas to my gear oil, there are several threads on that topic here.

 

I think Hyundai just says what viscosity to use.

Notice, there are different oil classes, like SF, SG, SH, SL (for gasolin engines). SL now is the best. Mobil1, Castrol are SL (for example)

I think Hyundai says - SG or better.

why do you all use 5W-30, 0W-30 and not XX-W40?

 

40 weight is too heavy unless you have an old leaky engine (Edit: too heavy for my zone anyway). I'd rather go down to 20 than up to 40.

Is XX-W40 a straight 40 weight oil? That's a really bad idea unless you have an oil pan heater.

 

XX - any numbers


I use 5W-40 it should cover 5W-30 range + a bit hotter range.

 

Well, I'm no expert, but I have done a lot of reading on oil and oil viscosity to be able to refute the lies spouted by my dishonest Toyota dealer on the sludge issue. You want to choose the narrowest spread in cold/hot weight possible. So if you only need a cold weight of 10 in the winter and a warm weight of 30, you are much better off going with 10w-30 than 5w-40. 5w-40 has to have a lot more viscosity improvers added than 10w-30, and these additives mean the oil breaks down more easily. The narrower the weight gap, the less additives are needed, and the better the oil will perform.

That's also why I switch to 10w-30 in the Summer, it's not below freezing in the mornings, so I don't need an oil that behaves like 5 weight when I first start the car.

There are a lot of reasons why you shouldn't use a heavier oil like 40 unless you have to. Generally, thicker the oil, the poorer a job it will do lubricating your engine.