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Engine Oil & Lubricants - Castrol

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STR588
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Castrol Classic Two Tone Mug


Traditional style enamelled tin mug. 

Perfect for a cuppa or to hold those important screws that you don't want to misplace

1928G
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Castrol classic Engine Oil 10W/40 GTX 5ltr - Mineral engine oil

5ltr Tin

CASTROL GTX CLASSIC 10W/40

Liquid Engineering from Castrol Classic Oils - the original is back.

Brought to you by Castrol Classic oils, Castrol GTX Classic 10w/40 is a high quality mineral engine oil for vehicles from 1978 to 1993. Produced to original formulation as specified in motor manufacturers’ vehicle handbooks. Containing anti-wear and anti-corrosion additives to provide high levels of protection necessary for older technology vehicles.

Castrol GTX Classic protects classic engines against problems like sludge, helping to extend the life of your mechanicals. With GTX Classic in your engine, there’s a great road ahead.

Castrol GTX Classic 10w/40, the original ‘Liquid Engineering’ for younger and modern classics:

  • Mineral 10w/40, suitable for vehicles 1978 to 1993 where a 10w/40 oil is specified
  • Period correct balanced additives for superior wear and corrosion protection, including ZDDP
  • Can be used in vehicles either with or without a catalytic converter
  • Suitable for both naturally aspirated and turbo-charged vehicles
  • Original handbook recommendation for many vehicles
  • Supplied in original style 5ltr can
  • API: SG



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

1928G
10W-40
10W
10W 40

The product you are viewing cross references to these numbers
1925
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Castrol classic Engine Oil 20w/50 XL 1 Gallon - Mineral engine oil

1 Gallon (4.54 Ltr) Tin

CLASSIC XL 20w/50

Castrol Classic XL20w/50 is a premium multigrade engine oil of good all round performance.  Formulated with high quality mineral oils, plus carefully selected additives, it is ideally suited to older technology and classic car engines.

  • For pre-1980 classic cars and motorcycles
  • A conventional 20W-50 multigrade engine oil
  • Formulated with high quality mineral oils plus selected additives
  • Ideally suited to older technology and classic car engines
  • Offers excellent oil consumption and a very high level of engine wear protection



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

1925
20w

The product you are viewing cross references to these numbers
19257176
Product Information
Product Information
Castrol classic Engine Oil 20w/50 XL 1ltr - Mineral engine oil

1ltr Tin

CLASSIC XL 20w/50

Castrol Classic XL20w/50 is a premium multigrade engine oil of good all round performance.  Formulated with high quality mineral oils, plus carefully selected additives, it is ideally suited to older technology and classic car engines.

  • For pre-1980 classic cars and motorcycles
  • A conventional 20W-50 multigrade engine oil
  • Formulated with high quality mineral oils plus selected additives
  • Ideally suited to older technology and classic car engines
  • Offers excellent oil consumption and a very high level of engine wear protection



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

19257176
20w

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 10 products)
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About Engine Oil & Lubricants - Castrol

Castrol Engine Oil & Lubricants - Porsche Approved Fluids & Protection

Castrol Engine Oil & Lubricants are engineered to meet the exacting performance and protection standards required by Porsche engines. Formulated for modern and classic Porsche vehicles, Castrol oils deliver consistent lubrication, thermal stability, and wear protection under everyday driving and high-performance conditions.

Supplied by Design911, Castrol lubricants support manufacturer-approved servicing, helping to maintain engine efficiency, reliability, and long-term durability across the full Porsche model range.

What Do Castrol Engine Oil & Lubricants Do?

Castrol oils play a vital role in maintaining Porsche engine health and performance.

Core Functions:

  • Lubricate internal engine components to reduce friction.
  • Maintain stable oil pressure and correct viscosity.
  • Protect against wear, corrosion, and harmful deposits.
  • Manage engine heat under load and high temperatures.
  • Support smooth performance and efficient operation.

Using the correct Castrol oil specification is essential for preserving Porsche engine integrity.

Why Do Engine Oils & Lubricants Fail?

All engine oils degrade over time due to heat, contamination, and operating conditions.

Common Causes of Failure:

  • Thermal breakdown from sustained high temperatures.
  • Contamination from fuel dilution, moisture, or debris.
  • Viscosity loss due to extended service intervals.
  • Incorrect oil grade or non-approved specification.
  • Increased stress from track use or aggressive driving.

Once degraded, oil can no longer provide adequate protection, accelerating engine wear.

When Should Castrol Engine Oil & Lubricants Be Replaced?

Timely oil changes are critical for Porsche engine longevity.

Replacement Is Recommended When:

  • Manufacturer service intervals are reached.
  • Oil appears dark, diluted, or contaminated.
  • Oil pressure warnings or increased consumption occur.
  • The vehicle is used for track days or performance driving.
  • Seasonal servicing or long-term storage is planned.

High-performance applications may require more frequent oil changes than standard road use.

Key Benefits

  • Porsche-approved Castrol formulations
  • Excellent thermal and viscosity stability
  • Reduces internal engine wear and deposits
  • Suitable for road and high-performance driving
  • Supports long-term engine reliability

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