Thread: Sythetic VS Regular 5W30

No matter what anyone says, even with synthetic I still change every 4k.

ha ha love that commercial.

Bob is the Oil Guy is a pretty decent site, but whether intentional or not has some misinformation. Your best bet is to talk to someone who works in an analysis department and get your info from the horse's mouth.

Here is what my engine looked like after running RP for only a little over a year. Clean:







My STI is getting the same treatment.

Royal Purple is nice, but Mobile 1 is good enough for me. It's still awesome oil.

For a high-mile car would youguys say Valvoline MaxLife synthetic blend or mobile 1 is better?

I'm using amsoil 5w30 and amsoil oil filter, going by the oil life indicator in the DIC, once it tells me its time to change oil I will, not before. I will send the old oil to blackstone labs for anaylisis and post my results

Originally Posted by tod1d

I'm using amsoil 5w30 and amsoil oil filter, going by the oil life indicator in the DIC, once it tells me its time to change oil I will, not before. I will send the old oil to blackstone labs for anaylisis and post my results

Yeah same here I go by the DIC not miles.

Originally Posted by BwolfGT

Yeah same here I go by the DIC not miles.

go by miles the DIC is off and a piece of shyt...

Originally Posted by BoostJunki3

go by miles the DIC is off and a piece of shyt...

tell that to GM and see what they say

Originally Posted by BoostJunki3

go by miles the DIC is off and a piece of shyt...

Incorrect. GM spent millions of dollars developing the oil life monitor. Lots of oil analysis done examining factors like engine load, engine temp, operating time, mileage, etc. It's quite accurate. I had my analysis done on some dino oil when the oil life monitor said about 10%, and the analysis agreed. It can be trusted.

Originally Posted by Sabrewings

Incorrect. GM spent millions of dollars developing the oil life monitor. Lots of oil analysis done examining factors like engine load, engine temp, operating time, mileage, etc. It's quite accurate. I had my analysis done on some dino oil when the oil life monitor said about 10%, and the analysis agreed. It can be trusted.

ive heard different but your a pretty knowledgeable guy so i guess i stand corrected

Anyone who thinks differently should present the analysis reports. Most people don't trust it because they don't know oil and don't understand how the OLM works.

DIC oil monitoring system is not accurate. It might be for conventional, but definitely not Synthetic. I ran 8k on my 2nd to last batch of Mobile 1 EP and my OIL Analyzers report showed a high silicone content. This was do to my K&N air filter ripped against my PCM. I have since replaced that filter with a new AEM dry flow and Ran Mobile 1 EP around 12k and it was time for an oil change based off my OIL ANALYZERS REPORT.

This is who I use
Oil Analyzers, Inc. - Analysis Program Details

Originally Posted by JJ91284

DIC oil monitoring system is not accurate. It might be for conventional, but definitely not Synthetic. I ran 8k on my 2nd to last batch of Mobile 1 EP and my OIL Analyzers report showed a high silicone content. This was do to my K&N air filter ripped against my PCM. I have since replaced that filter with a new AEM dry flow and Ran Mobile 1 EP around 12k and it was time for an oil change based off my OIL ANALYZERS REPORT.

It's not going to detect a problem like your air filter. It has no sensors or anything of that sort. It simply measures engine load, engine temps, RPMs, mileage, etc to determine when the oil should be changed. If your air filter is messed up that's your own fault.

It also assumes you're running dino oil so for synthetic users when it goes off you could most likely go longer. The OLM is no replacement for real analysis though.

Originally Posted by felonygtp

I don't really care what people in a lab say about how good a oil is. I see what happens in a race engine when Royal purple is used.
Your motor looks clean inside so I assume it was treated decent. I'm sure your engine isn't turning 6000-7000 rpm almost every minute of it's life. I don't remember the last time I started my pull truck motor to hook to a sled and go for a Sunday cruise, down by the lake.

To be fair, most professional racers do not use any off the shelf oils, including synthetic. Normal every day automotive oil is not intended for those conditions. So calling out one brand because it doesn't work properly in conditions it wasn't designed for is a little outside reason.

[/QUOTE]To be fair, most professional racers do not use any off the shelf oils, including synthetic. Normal every day automotive oil is not intended for those conditions. So calling out one brand because it doesn't work properly in conditions it wasn't designed for is a little outside reason.[/QUOTE]

Royal purple claims to be high performance. Brad Penn Grade 1 is high performance yet one works fine in race engine and the other doesn't why is that? Royal purple has a Race oil line and it doesn't work any better than its off the shelf brother.

Castrol SYNTEC = driving in extreme climates (frigid winters/scorching summers)
Castrol GTX = driving in moderate climates
Redline = racers

I'm thinking about trying that redline oil in my SBC there has been alot more guys running it in there alcohol motors. Its fresh this year and its cheap to rebuild if it doesn't work and its easier to get. I have to order Brad Penn oil and I hate having to have two cases on hand at all times because both motors take different oil.

I run 10w30 year around I probably should run 5w30 but I hate switching. My oil cap says 10w30 so I guess that's what I'll run. It seems like it can go from -30 to 100 in the same day in South Dakota, two weeks ago it was 70 and now there's snow on the ground.

Originally Posted by Sabrewings

It's not going to detect a problem like your air filter. It has no sensors or anything of that sort. It simply measures engine load, engine temps, RPMs, mileage, etc to determine when the oil should be changed. If your air filter is messed up that's your own fault.

It also assumes you're running dino oil so for synthetic users when it goes off you could most likely go longer. The OLM is no replacement for real analysis though.



To be fair, most professional racers do not use any off the shelf oils, including synthetic. Normal every day automotive oil is not intended for those conditions. So calling out one brand because it doesn't work properly in conditions it wasn't designed for is a little outside reason.

I never said it DIC used your airfilter for estimating how much time you have left on your oil. I used that as an example of why an oil analysis report is nice to have done, because I probably would not have caught that until I cleaned my air filter. I own a DHP powertuner and I can purposely mess around with the oil life system by throwing off my tune. GM just used the oil monitoring system for normal dino oil and never designed it for synthetic. Lets not also forget oil technology has changed in the last 12 years since my GTP came off the showroom floor.