1. Cold starts on a thick oil is like torturing the engine... Oil just doesnt start flowing.. An oil pump designed for a 10w30 may not push a 20w50 with the same efficiency.
2. Clearances gets wider.. The places where a thinner oil may have got faster, a thicker oil gets there slower and metal to metal contact happens.. Leading to widening of clearances.. Start off with the grade mentioned in your manual and when the clearances widens with time, go to a higher grade. (no options for w50 recommendations.. W60 is not available)
3. Mileage decreases
4. Read more about blanket formation in engine.. Its a phenomenon wherein the thick oil doesnt leave the walls of the engine and a blanket is formed inside the engine.. Hot freely flowing oil at the centre.. Thick cold oil on the walls.. Happens more with thick oils.
5. 20w50 has more VIIs than 20w40. I dont need to explain this to an expert :-)
its the quality of oil that matters the most.. Motul, shell, gulf, elf, mobil 4t, Servo 4t ... ok valvoline too (havent used it, but read some good reviews of this brand) are some good oils in the market.


). Low mark (on the dip stick) will reach in ~700kms.

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