Synthetic oil?

[JDav]

Just got a Supra again after I sold my 88 back in 93. LOVIN IT! My question is: I've heard/ seen/ been told it's not a good idea to run synthetic oil in a turbo engine. I've always run full synthetic in my Tundra & it's still runnin great after 300K, so I kinda like synthetic... can anyone offer some advice, experience or explanation?
Thanks!

 

[jetjock]

There's an entire sub forum dedicated to oil and whomever told you that had NFI what they were talking about. Not surprising though.

 

[mcammarn]

i know i heard of people saying not to use royal purple in our engine bc it tears down gaskets.

 

[hvyman]

You heard wrong. Or else everyone running rp would be leaking oil all over. It's rubber seals and silicone. Same goes for every engine.

 

[Poodles]

You heard wrong. Or else everyone running rp would be leaking oil all over. It's rubber seals and silicone. Same goes for every engine.

Actually, RP does tend to cause leaks because of it's base stock (vs say redline). It's additive pack isn't that good either for the price.

Regardless, kinda the wrong section, so moved.

 

[Orion ZyGarian]

Actually, RP does tend to cause leaks because of it's base stock (vs say redline). It's additive pack isn't that good either for the price.

Regardless, kinda the wrong section, so moved.

I havent heard this either. Where did you learn of this?

 

[jdub]

The cause for leaks is due to the cleaning ability of PAO based oils (like RP)...many times the only thing keeping older, worn seals from leaking is the gunk accumulating around them. PAO and ester (like Redline) does a great job of removing that gunk - the result? You now have a leaky seal. The difference with ester is it is also a very good seal conditioner and can cause seals to swell a bit, hence minimizing any leaks. Doesn't always work that way though...depends on the condition of the seals. On a new motor or one with new seals, PAO will not cause a leak.

I have to agree - the Additive pack in RP is not as robust as other oils in it's class. It can be used with good success and some motors love it...others, not so much

 

[Backlash2032]

So what would Mobil 1 5w40 full synthetic (doubtful that it's true full synthetic) be a good oil to run?

Before I get bashed for running too thick of an oil, I opened the bearing clearances a little bit on rebuild. Warm pressures are perfectly in spec, cold is a little too high for my liking so I wanted to go from 10-40 to 5-40 and that's the only oil I could find in 5-40

Sent from my terrible HTC Rezound using Tapatalk. Don't buy HTC...

 

[jdub]

Not a big fan of Exxon anything, but Mobil 1 will do a good job. I would use Rotella T6 5W-40 if it were me though....

 

[Poodles]

Pennzoil Platinum doesn't come in 5w-40, but their Ultra does. You'd have to check pricing though.

 

[hvyman]

There's redline as well.

 

[Orion ZyGarian]

As I recall, Mobil 1 synthetic has been a group 4 oil for a few years now..

 

[jdub]

Pennzoil Platinum doesn't come in 5w-40, but their Ultra does. You'd have to check pricing though.

Forgot Pennzoil Ultra is in a 5W-40...another excellent choice.

As I recall, Mobil 1 synthetic has been a group 4 oil for a few years now..

Mobil 1 switched from PAO to a Group III base stock many years ago to improve profits...and, they didn't tell anyone. Instead they spin it with this crap:
http://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Group_3_Base_Oils.aspx

And here's what Exxon says what a "synthetic" oil is (hydrocracked mineral oil):
http://www.mobiloil.com/USA-English/MotorOil/Synthetics/What_Is_Synthetic_Motor_Oil.aspx

Exxon is BS'ing, the definition of a "synthetic" is Grp IV (PAO) or Grp V (everything else, including ester)...Mobil 1 is neither, though it may contain PAO or esters.

Want to know what Exxon's base stock really is? It's called Visom (a Grp III+ according to Exxon) - look at this:
http://www.exxonmobil.com/UK-English/Basestocks/PDS/GLXXENBSKEMVisom.aspx

 

[T3rril79]

My car seems to like the castrol edge synthetic that i'm running it it just fine.

 

[jdub]

My car seems to like the castrol edge synthetic that i'm running it it just fine.

A highly analytical and very definitive statement... :3d_frown:

 

[Orion ZyGarian]

Mobil 1 switched from PAO to a Group III base stock many years ago to improve profits...and, they didn't tell anyone. Instead they spin it with this crap:
http://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Group_3_Base_Oils.aspx

And here's what Exxon says what a "synthetic" oil is (hydrocracked mineral oil):
http://www.mobiloil.com/USA-English/MotorOil/Synthetics/What_Is_Synthetic_Motor_Oil.aspx

Exxon is BS'ing, the definition of a "synthetic" is Grp IV (PAO) or Grp V (everything else, including ester)...Mobil 1 is neither, though it may contain PAO or esters.

Want to know what Exxon's base stock really is? It's called Visom (a Grp III+ according to Exxon) - look at this:
http://www.exxonmobil.com/UK-English/Basestocks/PDS/GLXXENBSKEMVisom.aspx

Good to know. I dont jump on it anymore and havent in a while, but I did remember a bit of hoopla on BITOG about it

 

[T3rril79]

A highly analytical and very definitive statement... :3d_frown:

Sorry, It was a bit vague. I guess I what I was point towards was that synthetic isn't causing any kind of remote harm to basically get to root of his question. To add info on what I run it is 10w-30 Castrol Edge w/ titanium.
[PDF]
PRODUCT DATA - Castrol
www.castrol.com/.../castrol/castrol.../EDGE_Titanium_PDS_april201
http://www.castrol.com/castrol/sect...EDGE&niadv=Castrol_EDGE-B&nipkw=+castrol_edge

 

[jdub]

Castrol has always had an excellent additive pack and Edge is no exception. It is a hydrocracked Grp III. Personally I would run the 5W-30 version for the lower cold start viscosity.

Glad you took my comment the way it was intended

 

[T3rril79]

Yeah it's starting to get a bit cold so I will probably switch to the 5w-30? Would the lighter weight be fine in the hotter months?

 

[jdub]

Yeah it's starting to get a bit cold so I will probably switch to the 5w-30? Would the lighter weight be fine in the hotter months?

That's one of the misconceptions about oil - a 5W-30 is only thinner than a 10W-30 at cold start temps. At ops temp (100 deg C), the viscosity is virtually identical...you have to look at the data sheets to be sure though. For the Castrol Edge products, they are....you can easily run the 5W-30 year round and the cold start viscosity will be better for the engine in the summer months as well.