New to me, 00' 6.8 2v , 157k
Po used synthetic oil but didn't specify brand, I did oil change with 5-20 Mobil 1, added 1gt in 3500 mi. Probably change at 5k.
read somewhere Castrol is better in Fords,
I'm sure just an opinion, looking for more input.
??
Thanks

 

I vote Valvoline MaxLife, 10w30.
Zero valid reason for a 20 weight in an 00, especially with 157K on the ticker.

 

 

Thanks for the feedback,
would y'all mind noting what year, engine and miles?
Ford specs 5-20, I see some using heavier oil?

 

Ford back-spec'ed their engines to 5w20 in many models that were originally running 30 weights.
Ford has a horrible track record for fluid recommendations based on which way the wind blows or how they can sell more of their proprietary spec oil.
My 99 Triton 2v went it's whole life on 5w and 10w 30's, the majority 10w. Approaching 200k at trade time.
MaxLife is an excellent oil by any measurable means. Combined with a Fleetguard LF16002 with Stratapore media, and it's about as good as it gets.

 

agree

there used to be a TSB or SB that even said if you have ticky tick noises you could go to 10W40

 

C350... Got the PM, I take a look at the reviews,
how long have you been using that brand?

 

 

 

I've always ran mobil 1 full synthetic in my f250 but i use castrol in everything else. Ive not had any problems with either one. Just a personal preference.

 

Check VOA reports (Bob is the Oil Guy has a LOT), the cSt differences in 5W-20s versus 5W-30s isn't always very much depending which end of the ranges a particular oil is at.

 

Whoa... You just blew by me, way too technical.
I didn't mean to open a can of worms.
After all the responses seems like I should use what seems right to me.

Thank you

 

 

Triax has popped up in other threads. If you are having good luck with it, great.
It appears they are not what they say they are. The Fleet Supreme oil supposedly meets Ford WSSM2C171F1 according to them, but Ford has not approved them for their list. The phosphorus and zinc levels do not meet Ford specs.
The fact they claim to meet the spec without actually being tested and certified for it, and suggesting they can go 80,000 miles without a change sends them packing IMO.
Looking at the Synergy line, you find a whopping 800ppm of MoDTC, or Molybdenum dithiocarbamates, an organo METALLIC friction reducer. Some moly, 50-200ppm is good, but that with as much as Triax claims to have, you will eventually develop deposits inside the engine. Ultra high moly oils will not pass TEOST, Thermo-Oxidation Engine Oil Simulation Test. TEOST tests to determine the ability of crankcase oils to control engine deposits.
And from the Triax website... (their misspelled words, not mine.)
"WHY ARE OUR PRODUCTS NOT API LICENSED
API only licenses pe-approved formulations which in general are sold by most brands, as API licensed fluids. At TRIAX, we are not satisfied with cookie cutter formulations. Most of our products are built on a foundation product but have been heavily modified to increase the oil's performance beyond what API requires, in all respects. Our improvements are being treated by API as a whole new formulation. To license new formulations the cost is between 350,000 USD to 1 MILLION USD per fluid, which is extremely expensive and unnecessary. All of our products will meet or exceed the performance requirements which make up the respective API specification, in virtually every single criteria. Essentially, 99% of API licensed fluids are the same few formulations being sold under hundreds of different brands. We want to stand apart from the crowd and bring our customers the absolute best engine protection today's technology can offer. "
So API licensing is just too expensive for them, and they probably wouldn't pass anyway. What will you do if there is a lubricant related failure, and your dealer says, sorry Charlie, your oil does not meet specs?
In contrast to all those glowing reviews, Triax will never go in anything I own.

 

A 20 weight and 30 weight can be within a percentage point of the same viscosity and be rated in different categories because the ratings are fairly narrow in range. Any multi-weight with a 5W rating will have 5 weight cold flow characteristics so starts aren't a concern with either. "Fuel economy" 5W-30 can be so close as to test the same as some 5W-20s.

Non-technical answer - basically anything that can run 5W-20 can handle 5W-30 fine - the oils are just really not that different. I used 5W-30 in a Chrysler V6 that book said 5W-20 on, it quieted the motor and dried up several leaks. Only change was 5W-20 to 5W-30, both were Mobil1 high mileage formulas.