Castrol Edge/ 5W-30 /5,778 miles/1998 Corvette

[Corvette Owner]

Because my last few Used Oil Analysis (UOAs) have shown some wear (increased lead), I have changed from Mobil 1 to Castrol Edge 5W-30 (and as always, I use a WIX oil filter). Later, after 6500 miles or so (I go by OLM), we will see if Edge has 8 times less wear.

Oh, BTW, I am aware that you can't always consider UOA numbers to show actual wear (according to some). But, something has changed the last 3 years, and maybe it was Mobil 1's formula? Maybe it is just my engine normally wearing (it has 119,681 miles on it). We shall see.

Here are my "increased lead" readings (note: I do not do a UOA every oil change)

Miles / Lead (ppm) / (Date) / miles on oil sample / Oil used

64,168 / 7 / (5/2003) / 6,036 / Mobil 1

95,517 / 11 / (4/2006) / 5,773 / Mobil 1

107,315 / 20 / (9/2007) / 6,127 / Mobil 1

113,499 / 18 / (6/2008) / 6,183 / Mobil 1

125,459 / 6 / (4/2010) / 5,778 / Castrol Edge

Note that the lead number went down significantly after I switched to Castrol Edge. Three times less !

I even sampled the Castrol Edge oil incorrectly. I didn't take an oil sample when I should (halfway into drain). I was checking oil level in transmission and adding some oil when I remembered to sample oil, all oil was drained. I then raised rear and drained out last 4 ounces.

I am not thrilled with the TBN of only 3.3 ! This is supposed to be 15,000 mile oil ?

 

[buster]

Well Pb is lower, but you need more samples before you can really tell. Can't read the rest of the report. Too small.

 

[jstutz]

At very least, it appears to do well for you. Are you staying with it?

 

[jstutz]

do you have TBN for the previous tests as well?

 

[Bill in Utah]

Okay, I (hopefully) fixed everything so we can continue with his UOA.

I moved some posts that were commenting on not being able to see the UOA.

Take care, Bill

 

[Corvette Owner]

Originally Posted By: jstutz
do you have TBN for the previous tests as well?


The only TBNs I have for Mobil 1 are as follows:

Date // TBN

04/2006 // 2.5

06/2008 // 2.7

 

[ctc]

Ok, not being a smarty but wouldn't most of the lead have been at the beginning of the drain?

 

[tig1]

For what it's worth I believe M1 typically produces very low bearing metal numbers.