Seat 2005 Toledo Owner's Manual page 218

216 Checking and refilling levels
Oil properties
Engine type
Petrol
Diesel
a)
Diesel Injector Pump
Diesel Injector Pump Motor 118 kW
Diesel Engines with Particulate filter (DPF)
a)
Only use recommended oils, otherwise you may damage the engine.
Mono-grade oil
Single grade oils are generally not suitable for all year round use, due to
21)
ranges of viscosity .
21)
Viscosity: oil density
Fig. 162 Types of oil
according to temperature
a)
a)
Viscosity
The viscosity class of the oil is selected according to the diagram.
When the ambient temperature falls outside the limits of the scale for a short
period, an oil change is not required.
Specification
VW 501 01/ VW 502 00/ VW 504 00
VW 505 00/ VW 505 01/ VW 507 00/ VW 506 01
VW 505 01/ VW 507 00/ VW 506 01
VW 506 01/ VW 507 00
VW 507 00
These oils are only useful in a climate that is constantly very cold or very
warm.
Engine oil additives
No type of additive should be mixed with the engine oil. The deterioration
caused by these additives is not covered by the warranty.