It's an NZE121, 2003 model. I have also been using Helix 5W-30 fully synthetic for the engine against the recommendations made by the service guys (they suggest that this oil is for hybrids and I should be using semi synthetic)
The reason they suggest semi synthetic for that model is that there are seals and 'O' rings built into the oil system that can be damaged by some oils.
The additives used as part of the mixture in fully synthetic oil are different to those used in semi synthetic and mineral oils and these can react with the seals causing expensive damage.
SOURCE: oil
Why not? Of course it can! What could happen to (any) engine because of that? A little bit worse (1 to 3%) fuel efficiency since 5W-30 is thicker than 5W-20! But, I'd ask you right now: Why you even consider synthetic blend? If you think that synthetic part (max 30%) in blended oil is going to improve mineral part you voluntarily admit that synthetic is better. USE (FULL) SYNTHETIC and have all the benefits - better mileage, extended drains, cleaner engine, better winter start, smoother operation... Want more? Why to waste natural resources if you can have simpler and better maintenance with synthetics? Do not forget good air and oil filters! They keep engine's longevity! If you want recommendation(s) - use Amsoil (XL oil for 7500 mi) or Mobil (extended). All others are (poorer) copies of them! For the filters - again Amsoil! Absolutely better than K&N! Same air flow and 50 times (!!!!!) better filtration. (If you need more info call 519-739-3765)
SOURCE: my 2000 gmc sierra is leaking oil on my driveway more than normal
It's not good to Switch back to Regular oil after using Synthetic. Use the High Mileage oil. It will help a Little. Still Cheaper to replace a Gasket or two than a Rebuild. Got 214,000 + Miles on my 95' Silverado and No Leaks with High Mileage Valvoline 10-40.
SOURCE: Use of recommended oil viscosity (5w-20)
I ask that same question about my 2007 and was told that the main reason for the lite oil weight was to give better gas mileage. Still though I never changed because I got over tinkering with the manufactures specs. in my hot rod days. Stay with the 5-20W.
SOURCE: Can I use 10W-40 engine
Mazda recommend 10/40 for all far eastern/European cars so i dont see what the problem is.....it is semi synthetic though.unless you live in a very cold climate 10/40 is fine.
SOURCE: Hi, I drive a 2006 Saturn Ion and after I
The oil wouldn't cause that problem since their the same weight. You could have a problem if you ran the car with low oil. You should check your coolant and transmission fluids and make sure they are ok. You could have a bad piston. Is your check engine light on?
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