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Heavier oil? #5385171 03/25/20 08:06 AM
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otis24 Offline OP
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1991 Chevrolet K1500, 4.3 V6, 116k miles (estimated, due to broken odometer). Has had bad valve stem seals since I purchased it five years ago with 89k miles. Always a blue puff of smoke on startup. I can't tell if it is smoking badly now. Lately, it is starting to use a lot of oil. A quart every few months. I don't know if this could be from the bad stem seals, or if rings are getting worn? I might mention that this vehicle is a short tripper. I was doing once-per-year oil changes. Thinking I am doing about 6k miles per year or less. Decided I will start doing twice-per-year oil changes due to the short trips. Wondering if a 40 weight oil will reduce consumption. I've been using a 5w/30 as spec'd (although I put 5w/20 this last oil changed because that's what I had on hand). Thinking of going to a 5w/40 or 10W/40, for summer. Maybe even a 15W/40. Thoughts and suggestions welcome.


1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles
Re: Heavier oil? [Re: otis24] #5385178 03/25/20 08:11 AM
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WyrTwister Offline
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Do a wet and a dry compression test .


Wyr
God bless
Re: Heavier oil? [Re: otis24] #5385181 03/25/20 08:13 AM
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Snagglefoot Offline
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You have nothing to lose by trying a 10w40 year round or the 15w40 in the summer. smile

Last edited by Snagglefoot; 03/25/20 08:18 AM.

If you want the job done right......do it yourself.
Re: Heavier oil? [Re: otis24] #5385185 03/25/20 08:17 AM
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Astro14 Offline
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Couldn’t hurt...

Look, if you’re driving 6,000 miles/year, and you’re adding a quart every “couple” of months, then you’re adding a quart every thousand miles or so, which isn’t terrible.

In fact, with blue smoke on startup, it’s probably just the valve stem seals...nothing else...and heavier oil may help with that.

Valve stem seals aren’t a hard job on this. But heavier oil is cheap. Might as well see how it works.


32 Packard 15W40
01 Volvo V70 T5 0W30 AMSOIL SS
02 Volvo V70 T5 0W30 Edge
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 5W30 Pennzoil Ultra
Re: Heavier oil? [Re: otis24] #5385186 03/25/20 08:19 AM
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ARCOgraphite Offline
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Nope on the 40. Garbage oil.

Run the 5W30, your hydraulic lifters need a certain leakdown rate. to give you good torque and fuel economy.

You should NOT have run the 20 grade oil!

Just do the Stem seals if the compression test points that way, easy enough job.

but is suspect it was just a neglected and carboned up

rings and pistons.

Thicker oil is usually never the solution unless t you have big miles, and you dont.

Last edited by ARCOgraphite; 03/25/20 08:21 AM.

2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#9 70254mi-Rotella
Gas Truck 5W20 + Fram Ultra 7317 Filter
Re: Heavier oil? [Re: Astro14] #5385189 03/25/20 08:21 AM
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SR5 Offline
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Originally Posted by Astro14
Couldn’t hurt...

.....

Valve stem seals aren’t a hard job on this. But heavier oil is cheap. Might as well see how it works.



Exactly, just give it a go, it’s not going to hurt anything.
I’ve swapped between 5W30 synthetic and 15W40 mineral a few times. It all works.


---------------------------------------------------------------------------------
Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: Heavier oil? [Re: otis24] #5385196 03/25/20 08:30 AM
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Olas Offline
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a leakdown test will tell you where the oil is leaking into the cylinder.

replace the worn/faulty component.

Re: Heavier oil? [Re: otis24] #5385292 03/25/20 10:26 AM
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BAJA_05 Offline
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Sounds like valve stem seals also to me. If your not gonna replace those -- move to a 10W30 or 10W40 High Mileage motor oil during summer months.


2017 VW Jetta SE TSI 1.4L Turbo (hers)
PP Euro 0W40 & FU (42K)
2008 Acura TL 3.2L PPHM 0W20 & FU (117K)
2005 Subaru Baja AWD 2.5L N/A 5spd.
T6 MV 5W30 & FU (103K)
2000 Ram 4X4 5.2L (93K) T6 MV 5W30 & FU
Re: Heavier oil? [Re: otis24] #5385310 03/25/20 10:41 AM
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CT8 Offline
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Originally Posted by otis24
I put 5w/20 this last oil changed because that's what I had on hand). Thoughts and suggestions welcome.

interesting


2015 F150 2.7
2018 F350 6.2
Re: Heavier oil? [Re: otis24] #5385351 03/25/20 11:25 AM
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Triple_Se7en Offline
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Sometimes we are better off donating 5w20 oil to the Vietnam Vets Club, than use it because it's sitting in the garage.
I once put 5w20 in my 4.3 S10 and when I changed the oil 5K later, the magnetic drain plug was loaded with shiny silver shavings.

The idea to move up to 10w40 in South Dakota is your best idea, if you are not mechanically-inclined to fix the oil loss yourself.


2019 Hyundai Santa Fe 2.4 GDI - Pennzoil Ultra Platinum 5w30 / OEM 35504 Filter
2020 Kia Soul X-Line 2.0 MPI - a 50-50 blend of Pennzoil Platinum HM & Pennzoil Gold 5w30 // AC Delco PF1127 Ecore




Re: Heavier oil? [Re: otis24] #5385352 03/25/20 11:26 AM
Joined: Mar 2015
Posts: 15,291
53' Stude Offline
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Originally Posted by otis24
1991 Chevrolet K1500, 4.3 V6, 116k miles (estimated, due to broken odometer). Has had bad valve stem seals since I purchased it five years ago with 89k miles. Always a blue puff of smoke on startup. I can't tell if it is smoking badly now. Lately, it is starting to use a lot of oil. A quart every few months. I don't know if this could be from the bad stem seals, or if rings are getting worn? I might mention that this vehicle is a short tripper. I was doing once-per-year oil changes. Thinking I am doing about 6k miles per year or less. Decided I will start doing twice-per-year oil changes due to the short trips. Wondering if a 40 weight oil will reduce consumption. I've been using a 5w/30 as spec'd (although I put 5w/20 this last oil changed because that's what I had on hand). Thinking of going to a 5w/40 or 10W/40, for summer. Maybe even a 15W/40. Thoughts and suggestions welcome.



How about Maxlife 10w30 blend


2009 Toyota Camry LE
Re: Heavier oil? [Re: 53' Stude] #5385370 03/25/20 11:41 AM
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aquariuscsm Offline
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Originally Posted by 53' Stude
Originally Posted by otis24
1991 Chevrolet K1500, 4.3 V6, 116k miles (estimated, due to broken odometer). Has had bad valve stem seals since I purchased it five years ago with 89k miles. Always a blue puff of smoke on startup. I can't tell if it is smoking badly now. Lately, it is starting to use a lot of oil. A quart every few months. I don't know if this could be from the bad stem seals, or if rings are getting worn? I might mention that this vehicle is a short tripper. I was doing once-per-year oil changes. Thinking I am doing about 6k miles per year or less. Decided I will start doing twice-per-year oil changes due to the short trips. Wondering if a 40 weight oil will reduce consumption. I've been using a 5w/30 as spec'd (although I put 5w/20 this last oil changed because that's what I had on hand). Thinking of going to a 5w/40 or 10W/40, for summer. Maybe even a 15W/40. Thoughts and suggestions welcome.



How about Maxlife 10w30 blend


Sounds like a good plan. Try a 10W30 hm oil.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum High Mileage 10W30

Re: Heavier oil? [Re: otis24] #5385390 03/25/20 12:00 PM
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benjy Offline
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when the spec 5-20 went thu girlfriends 2.5L 13 oil burning malibu i switched to 10-30 which helped a while, then to a 5-40 + as it was using over a qt on a thou at only 60 thou she dumped it for a preowned optima 2.4 L that uses NONE. sooner or later yo might need to trade or fix or just keep dumping in the oil!! i was using 20-50 in my 72 nova, ok until it got cold + would not crank fast enough to start!!

Re: Heavier oil? [Re: otis24] #5385510 03/25/20 03:06 PM
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skyactiv Offline
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Worn valve stem seals are common on 4.3's, but very easy to replace with proper tools. Small tidbit on a truck my dad once owned:
https://www.bobistheoilguy.com/forums/ubbthreads.php/ubb/showflat/Number/5096175/Searchpage/1/Main/308717/Words/4%5C.3+/Search/true/re-my-auction-find-1996-chevrolet-c1500-w-t#Post5096175




Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: Heavier oil? [Re: skyactiv] #5385801 03/25/20 09:01 PM
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Mad_Hatter Offline
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Originally Posted by skyactiv
Worn valve stem seals are common on 4.3's, but very easy to replace with proper tools. Small tidbit on a truck my dad once owned:
https://www.bobistheoilguy.com/forums/ubbthreads.php/ubb/showflat/Number/5096175/Searchpage/1/Main/308717/Words/4%5C.3+/Search/true/re-my-auction-find-1996-chevrolet-c1500-w-t#Post5096175



That's not that bad on that engine at all. The one and only time I've done valve seals was on a transverse 6. It was a PITA doing the bank 1 valves due to things being so "tight" and having to reach back in there and the plenum and throttle body had to come off so that added time. By comparison bank 2 was a breeze, the valves were staring right at you with tons of room to work..any way you cut it, it's still a bit of work for some stupid small seals but totally doable if you're patient/attentive to detail and halfway mechanically inclined.

Last edited by Mad_Hatter; 03/25/20 09:06 PM.
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