I run full synthetic Valvoline high mileage 5W-30 oil in my HL 3.3 V6 engine. I believe that the 0W-20 oil is for the 3.5 V6 not the 3.0/3.3 V6 engines.

 

Recommend sticking with a good brand of 5w-30 full synthetic. It’s a flat tappet engine….

I use primarily pennzoil platinum or platinum ultimate. 345k miles. Have also used Mobil 1. No need for “high mileage” oil here.

 

5w-30 is best for the 3MZ. 0w-20 is like water... Even tastes like it... it might as well be water with brown food coloring.

 

The pervious owner didnt change the oil on a timely basis. Lots of varnish. Im thinking the thin stuff WITH high mileage additives might loosen the crud and keep the small lubricating holes running well. PLUS its winter. 6F temps. Is my thought process off?

 

heres a cool video for ya'll.

its not meant to be scientific. just a cool (long term) demonstration of a particular brands oil. cool none the less.

 

I’d still go 5w-30. The safe approach in your case is short ocis with good oil for 3 or four changes.

 

Yep, I switched all our vehicles to full synthetic years ago. There's urban legends that say switching an engine from conventional oil to the lighter synthetic will make gaskets leak....not true.

But never switch viscosity...always put what it says in the oil refill cap. (Thicker/thinner oil can affect the sensitive VVT-i system.)

I'm excited for the new Valvoline oil "Restore and Protect" for our older vehicles....will be using that on their next oil change....I'm seeing it sold in more and more locations, including Walmart.

 

Wrong way of looking at the issue for sure. Like you mentioned; modern synthetic oil do not damage seals. However, if you have an neglected engine that is sludged and decided to clean it out with a flush or start to use synthetic oil with a good detergent then your engine may leak when the synthetic oil or engine flush clear away the sludge that was blocking an damaged seal and prevented it from leaking oil outside the engine.

 

Valvoline makes a good oil for de-crudding your engine - Valvoline Restore & Protect

 

Walmart High Mileage 5w30 🤨I think we ALL agree on full synthetic. Okay! Done....... BUT now what about the filter!? I hear high end Frams arent as good as Mobil1

 

I use Denso or Bosch oil filters.

 

here are some tests with actual data.

and a follow up

 

gawd, i cant stand "click Bait" thumbnails...
the videos are good with good content. they didnt need these cheap and cheesy thumbnails.

 

Denso, from rock auto.