switching oil thickness at change

[xxdjstriderxx]

Ive had my car since last fall and its been running great on 10-30 oil but i figure since i regularly warm up my engine before i drive and its going to be fairly hot during the summer would it be ok to make a switch to 10-40 oil at my next change? Ive also been running regular 10-30 castrol gtx high mileage, would it hurt any to use a synthetic or a blend?

Also im thinking about using one of those engine flushing cleaning things, do they f**k up your engine or what? If theres anything worth using, any reccomendations? Thanks.

[:: orion ::]

Flushes are bad...can break loose sludge and clog oil passages...which equals dead motor.

10w30 or 10w40...very similar, so run whatever one you like.

I ONLY run Mobil 1...I'll put up with tiny oil leaks for oil that's 10X better than dino oil.

- Brian

[Bronze MFP]

Mobile one is great, if you're worried about cleaning the engine out, valvoline supposedly has a great detergent package in their synpower oil. I've run both (valvoline/mobile1 synthetic), and will never use regular oil again.

[bryanmenard]

I use Valvoline SynPower 10W40 in all my cars. I used to use Mobil-1 10W30 until I bought a VW Jetta, which requires 40-weight oil. Mobil-1 doesn't have a 40-weight other than OW40 and 5W40 Truck/SUV.

In Texas, there is no need for 0W or 5W-anything with this heat.