changing oil to lower viscosity

[spyghost]

hi,

is there a risk of oil leaking fromt the seals when you switch to a lower viscosity oil?

[1D4LV]

^^depends on the age of your car. for older cars or for cars which are probably 10 years or older, probably yes, because of the brittle oil leaks. for newer cars, nope.

[speedyfix]

may chance sya. you can do it and just replace the seals if you like. but if you don't wanna have to bother with that then keep using the viscosity you have now.

[rayban7g]

Eto para may idea/info ka:

* If you've been driving around with mineral oil in your engine for years, don't switch to synthetic oil without preparation. Synthetic oils have been known to dislodge the baked-on deposits from mineral oils and leave them floating around your engine - not good. I learned this lesson the hard way! It's wise to use a flushing oil first.

* If you do decide to change, only go up the scale. If you've been running around on synthetic, don't change down to a mineral-based oil - your engine might not be able to cope with the degradation in lubrication. Consequently, if you've been using mineral oil, try a semi or a full synthetic oil. By degradation, I'm speaking of the wear tolerances that an engine develops based on the oil that it's using. Thicker mineral oils mean thicker layers of oil coating the moving parts (by microns though). Switching to a thinner synthetic oil can cause piston rings to leak and in some very rare cases, piston slap or crank vibration.

* Gaskets and seals! With the makeup of synthetic oils being different from mineral oils, mineral-oil-soaked gaskets and seals have been known to leak when exposed to synthetic oils. Perhaps not that common an occurrence, but worth bearing in mind nevertheless.

Excerpt from carbibles.com

More of this at: http://www.carbibles.com/engineoil_bible.html

[speedyfix]

not to say na di rin tutulo yung langis mo sa current viscosity. pag sira na seal, replace it. end of story.