[T3] Stupid question #395 Oil change time?

Keith Park topnotch at nycap.rr.com
Sun Jun 2 09:59:46 PDT 2019

When the Squares last engine was new, I used 30wt, that was fine, 38lbs of
oil pressure on a hot day on the highway, 12 at idle.

As the engine aged it became 10W40 and that was good for a long time,
finally with over 100K on it I switched to 25W50 as that was a racing engine

oil and had the ZDDP in it, and that helped with the oil pressure as the
engine continued to wear and when it was done at 165K I had about 25-26psi
on the highway on a hot day and 5Psi at idle, hate to think what that would
have been with the SAE30.


Topnotch Restorations
topnotch at nycap.rr.com
71 Squareback  "Hothe"
65 Notchback  "El Baja Rojo"
93 RX7  "Redstur"
95 Chrysler Cirrus Lxi "Cirfogsalot"
"hanging out at the tail end of the bell
curve, and loving every minute of it!" 
-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of William Jahn
Sent: Saturday, June 01, 2019 11:05 PM
To: type3 at vwtype3.org
Subject: Re: [T3] Stupid question #395 Oil change time?

Forgot since I don't really every drive far and long enough perhaps SAE30
is good enough since it's really all about flow. I did read at several
sites that you cna't mix say 20W50 with 10W40 because of the molecular
structure is different that makes up the viscosity of each grade. If true I
did mix 1 pint of 10W40 in because I was short on 20W50, who knew..

On Sat, Jun 1, 2019 at 7:58 PM William Jahn <willjahn975 at gmail.com> wrote:

>  I do understand that SAE30 might be better than SAE40 . I don't see any
> white buildup in the breather. I do seem to hear a bit more tappet noise
> since I changed the oil  unless I'm just much more focused it. When I last
> adjusted the valves 5/30/15 around the same time I last changed the oil
> the rockers had oil in them, I pushed them down to see if the valve
> clearance was was @.006". I suppose when I change the oil again within the
> next week I should pull the valve covers just to check it out in there. On
> the SAE30 I see a few different charts most agree SAE 40  the low end temp
> is 50* F and high end is 113 to 122 *F. they seem to indicate that SAE30
> good to around 100* F .
> On Fri, May 31, 2019 at 10:56 AM William Jahn <willjahn975 at gmail.com>
> wrote:
>> The odd part is all sites have reviews and there is not one on the STP
>> brands autozone sells so people either don't bother with reviews since
>> all BS or just use the STP and are happy with it. I just feel Valvoline
>> what it is so I went with that.
>> On Fri, May 31, 2019 at 10:51 AM William Jahn <willjahn975 at gmail.com>
>> wrote:
>>>  Jim, I imagine SAE 30 would have been fine I never used 30 in this
>>> engine which doesn't mean anything. I was more concerned of how hot it
>>> become here. The way the traffic is here there is not a time when I can
>>> drive above 45 MPH , even on a freeway you might get to 55 or 60 for a
>>> or 2 then it's stop and go. Just to get on a freeway I need to drive 6
>>> miles stop and go. I realize it's the starting that produces the most
>>> I was watching my oil temp and pressure gauges just glancing once I had
>>> driven 5 miles 2 days ago on this 20 mile round trip and noticed the
>>> climbed more as I was at idle since there is not a lot of cooling air
>>> flowing plus ambient temps rise from the heat off all the cars all
>>> me. I fell for the misconception that multi grade oil became thicker
>>> it does not so I can't say only assume that the 20W50 was in a sense
>>> than SAE 30. I saw the same thing searching O'Reilly's site that they
>>> their own brand and saw a video of one fellow talking about house brands
>>> are most likely branded name brand oil which is probably the relation
>>> between Autozone and STP which is close to half the price on any name
>>> oil they sell. If it is in fact good oil then I have a easy choice to go
>>> SAE 30 if needed. Fact is thinking about this I only recall using
>>> 20W50 twice and this was when Autozone stopped selling Castrol SAE 40
>>> STP is a fairly new addition in Autozone's oil selection didn't see it
>>> their site until this year. Perhaps enough people wanted SAE 30 and 40
>>> since they took it away years ago. I'd much prefer walking into a FLAPS
>>> purchase than having it shipped. I have 3 quarts of Valvoline 10W40
>>> used it. Felt it might not lube well enough  and from what I've read "
>>> it's better to stay away from the 10W-40s, as they have a higher content
>>> long-chain polymers to get the 40 rating from a thin base, and the
>>> are not lubricants themselves." I got this info from here.
>>> http://www.vw-resource.com/engine_oil.html   for what it's worth.
>>>  I don't know why autozone used the STP name , they used have an
>>> autozone brand name oil and perhaps placing the STP brand made it more
>>> trustworthy and as far as I know it very well may be the same autozone
>>> brand oil in a paid for STP labeled bottle.
>>> "
>>> On Fri, May 31, 2019 at 6:54 AM Jim Adney <jadney at vwtype3.org> wrote:
>>>> On 30 May 2019 at 16:00, William Jahn wrote:
>>>> > I found out that the STP SAE30 & 40 are made by autozone by calling
>>>> STP
>>>> > autozone gets to use their trade mark for a price. STP only deals
>>>> > their additives.
>>>> And Autozone oil is probably made by some major brand that we would all
>>>> recognize.
>>>> I once had to make an emergency oil stop at an O'Rileys and was faced
>>>> with
>>>> a bunch of O'Rileys oil that I'd never seen before. The guy at the
>>>> counter
>>>> told me that it was all actually Valvoline, same oil, same additives.
>>>> He'd been
>>>> to the factory and watched the same oil, just put into different color
>>>> bottles,
>>>> coming down the line and put into different cartons. I suspect that all
>>>> house
>>>> brand oil is done this way. It could even be different makers done
>>>> under
>>>> different contracts in different years. It sounds like they are allowed
>>>> to talk
>>>> about this fact but not advertise it.
>>>> I used to work with a guy who serviced big industrial air compressors.
>>>> He
>>>> managed to spec his own oil and get someone to mix and package it just
>>>> for
>>>> him. I suspect that oil came in 5 gallon buckets with a minimal label.
>>>> Or
>>>> maybe he had to buy 55 gal drums. I should ask him.
>>>> --
>>>> *******************************
>>>> Jim Adney, jadney at vwtype3.org
>>>> Madison, Wisconsin, USA
>>>> *******************************
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