Originally Posted By: oilchangeguy
My 2.3l is a very noisy engine. Would going to 5w30 quiet it down? Currently running 5w20. Any recommendations?
Thanks
Any Shell oil should quiet it down. QSGB, PP and also the Rotella T5/T6 have worked well for me in the past with these engines. The Rotella was by far the quieter oil. I did see a small MPG hit with the T6.
I see you have the MC filter so that should not be causing the noise.
As someone else mentioned, it could also be the intake flapper valve but those usually don't go bad until 100,000+ miles, and the noise will reveal itself at idle speed for awhile before migrating to all rpm's.
Also don't confuse the noisy fuel injectors for oil related noises. If this is the case run some Chevron fuel injector cleaner with a tank of name brand premium and go do an italian tuneup on the highway.