Good Sam Club Open Roads Forum: Tow Vehicles: MOTOR OIL ?
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 > MOTOR OIL ?

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Oasisbob

Portland Oregon 97266

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Posted: 12/09/19 07:36pm Link  |  Quote  |  Print  |  Notify Moderator

After learning a certain oil change facility does not always change the oil filter when doing an oil change I went back to doing it myself. Things have changed on the motor oil shelf. So many choices. Synthetic, petrolium, blended. My question is if I go synthetic and need to add oil later can I mix petrolium with synthetic? What is blended? Is "high mileage" oil any different? Howq? Thanks for any info you may share


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Morro Bay, CA

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Posted: 12/09/19 07:40pm Link  |  Quote  |  Print  |  Notify Moderator

Why aren’t you following the vehicle manufacturer’s recommendations?


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


deltabravo

Spokane, WA

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Posted: 12/09/19 07:44pm Link  |  Quote  |  Print  |  Notify Moderator

Oasisbob wrote:

My question is if I go synthetic and need to add oil later can I mix petrolium with synthetic?


* This post was edited 12/10/19 06:53am by deltabravo *


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FishOnOne

The Great State of Texas

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Posted: 12/09/19 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

You can mix synthetic oil with conventional. (See Synthetic Blend oil below).

Blended oil is marketed as Synthetic Blend which is both synthetic and conventional base oils mixed together, but there's no requirement for how much synthetic is used.

High Mileage oils typically have more seal conditioning additives to help prolong the life of the seals. I prefer not to use these oils unless you stick with them for the life of the engine.


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philh

Belleville MI

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Posted: 12/09/19 08:39pm Link  |  Quote  |  Print  |  Notify Moderator

mix and match, change up if you like. Today's it's an old wives tale, that actually had a basis of fact in the past.

Friend was a mechanic that had a car come in with a failed engine. A little thick sludge came out of the drain. After an investigation, turns out the female owner religiously took her car to the same quickie oil change place for an oil change every 3000 miles... except for (IRC) 50,000 miles, it never got changed.

srt20

Wisconsin

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Posted: 12/09/19 08:42pm Link  |  Quote  |  Print  |  Notify Moderator

deltabravo wrote:

Oasisbob wrote:

My question is if I go synthetic and need to add oil later can I mix petrolium with synthetic?


It's not recommend to mix oil types.

by who?

Oasisbob

Portland Oregon 97266

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Posted: 12/09/19 08:50pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks guys. I knew you would know. This is what makes this forum great. People helping people. In my day mixing synthetic with pertolium was a no no. Things change

MitchF150

Puyallup, WA

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Posted: 12/09/19 08:56pm Link  |  Quote  |  Print  |  Notify Moderator

I bring along a couple qts of the same oil I use along with me on long trips in case I need to top off for whatever reason..

So far, have not needed to, but it's nothing to take it along anyway..

Mitch


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opnspaces

San Diego Ca

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Posted: 12/09/19 09:25pm Link  |  Quote  |  Print  |  Notify Moderator

Oasisbob wrote:

After learning a certain oil change facility does not always change the oil filter when doing an oil change I went back to doing it myself.


I've never heard of this. Are you referring to a particular local shop, or is this a chain policy?


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BenK

SF BayArea

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Posted: 12/09/19 10:17pm Link  |  Quote  |  Print  |  Notify Moderator

Most all engine oil are made from crude.

The difference is in how they are refined and additive packages

Early days of synthetic did have OEM’s not recommend mixing

Today, most say ok and I’d add of the same spec

Issue is with their additive package compatibility and not going to kill an engine instantly. Just altered additive package

As for cheating, sure thing...occasionally local news expose has a complaint and proved via marked oil filter and oil analysis

Do my own, but occasionally use a drive through when squeezed for time and one place just change their rules requiring to stay in the vehicle...so can’t see the oil drain n filter come out


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

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